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Notes on Buddhism and Jainism


Buddhism and Jainism are two branches of the Samana tradition that still exists today. Buddhism and Jainism originated from the prevailing pessimism of the time and both creeds had some common points.

Jainism and Buddhism had the largest number of followers among the mercantile class. Both Mahavira and Buddha preached their doctrines in the language of the people.

➤Buddhism :

• Buddhism was started by Gautam Buddha who was also known as Sakyamuni and Tathagata

• Gautam Buddha was born in the year 563 B.C at Lumbini near Kapilvastu district of Nepal on the day of the Poornima (full moon day)

• His childhood name was Siddhartha

•  His father’s name was king Suddhodhana who was the ruler of the Saka dynasty and the mother’s name was Mahamaya who was the princess of the Kosalan dynasty

• 7 days after the birth of Gautam Buddha, her mother died and he was brought up by his stepmother Mahaprajapati Gautami  who gave him the  title of Gautam

• In his childhood Gautam Buddha use to play with his horse named Kanthak

• At the age of 16 years Gautam Buddha was married with extremely beautiful Yasodhara and had a son named Rahula

• After seeing the sorrow of the world Gautam Buddha decided to leave the pleasures of the life and start living the life of the wanderer

• At the age of 29 years he left home in search of salvation or Nirvana and reached Vaishali where he became the disciple of Alara Klama but he was not convinced by the teachings of Alara Klama and he moved from there and became the disciple of Udraka Ramputra

• He wondered for 6 years and one day at Bodh Gaya under the Peepal tree (bodhi tree) he attained the Nirvana or Enlightenment at the age of 35 years

• Tapasso and Mallic became the first disciple of Gautam Buddha whereas Ananda was the most favorite disciple of Gautam Budddha

• Gautam Buddha delivered his first sermon at Sarnath on the topic “Dharmachakrapravartan” or Turning of the Wheel of Law

• In his last days of life he reached Vaishali where his disciple named Kunda fed him pork due to which he died at the age of 80 years in the year 483 B.C at Kushinagar district Deoria in the Malla republic. His death is known as Mahaparinirvana

➤Important events in the life of Buddha :

Events

Places

Symbols

Janma

Lumbini

Lotus and Bull

Mahabhinishkramana

 

Horse

Nirvana

Bodh Gaya

Bodhi Tree

Dharmachakra Pravartana

Saranath

Wheel

Mahaparinirvana

Kushinagar

Stupa

➤Doctrines of Buddhism :

• Four noble truths

1. Dukha – life is full of sorrow

2. Samyuda – there are causes for the sorrow

3. Nirodha – they can be stopped

4. Nirodha Gamini Pratipada – Path leading towards cessation of sorrow

• Eight-Fold Paths of Buddhism

1. Right observation

2. Right determination

3. Right exercise

4. Right action

5. Right speech

6. Right memory

7. Right meditation

8. Right livelihood

• Madhya Marga – to avoid the excess of both luxury and austerity

• Triratnas – Buddha, Dharma and Sangha

➤ Buddhist Literature :

The Buddhist literatures were written in the Pali language

• Vinay Pitaka

It deals with the laws of the Buddhist monasteries. It was recited by Uppali in the first Buddhist council in the year 483 B.C

• Sutta Pitaka

It is the collection of the Buddha’s sermons and it is divided in 5 parts

• Abhidhamma Pitaka

It deals with the life and the philosophy of the Buddha’s teachings

• Milindapanho

It deals with the conversation with the Greek king Menander and the Buddhist Monk Nagasena

• Tripitaka

It is the sacred book of the Buddhism

➤Buddhist Councils :

1. First Council

The first council was held in the year 483 B.C at Saptaparni caves near Rajgriha in Bihar under the chairmanship of king Ajatshatru, during the first council two Buddhist literatures were compiled Vinaya and Sutta Pitaka by Upali

2. Second Council

The second council was held in the year 383 B.C at Vaishali under the chairmanship of king Kalashoka

3. Third Council

The third council was held in the year 250 B.C at Patliputra under the chairmanship of king Ashoka the Great, during the third council Abhidhamma Pitaka was added and Buddhist holy book Tripitaka was compiled.

4. Fourth Council

The fourth council was held in the year 78 A.D at Kundalvan in Kashmir under the chairmanship of king Kanishka, during this council Hinayana and Mahayana were divided.

➤Types of Buddhist :

The Buddhism after the death of Gautam Buddha was divided into 3 parts

1. Hinayan

They believe in the real teachings of Gautam Buddha of attaining Nirvana. They do not believe in idol worship and Pali language was used in the Hinayana text

2. Mahayana

They believe that Nirvana is attained by the grace of Gautam Buddha and not by following his teachings. They believe in idol worship and Sanskrit was used in Mahayana text

3. Vajrayana

They believe that Nirvana is attained by the help of magical tricks or black magic.

➤Famous Monks at the time of Buddha :

• Ananda – constant companion of Buddha and most devoted disciple

• Anurddha – master of right mindfulness

• Mahakassapa – president of Buddhist council held at Rajagriha

• Moggallana – he had greatest super natural powers

• Sariputta – possessed the profound insight into the dhamma

• Upali – master of Vinaya

➤Famous Buddhist Scholars :

• Ashvagosha – contemporary of Kanishka, poet, dramatist, musician who wrote famous book Buddhacharita

• Nagarjuna – friend and contemporary  of Satavahana kings wrote the famous book Madhyamik Shastra

• Buddhagosha – pali scholar  who wrote “Visuddhimaga”

• Dinnaga – founder of Buddhist logic

➤Important Buddhist Gods and Goddess :

1. Buddha Shakyamuni – the historical Buddha

2. Buddha Maitreya – the future Buddha.

3. Avalokiteshavara – the Bodhisattva of Compassion

4. Manjushri – the bodhisattva of wisdom and literature.

5. Tara – a female Bodhisattva. She is considered a great protector that guards people against the eight major dangers in life

6. Padmasambhava – also called Guru Rinpoche, is the historically tangible founder of Tibetan Buddhism

➤Jainism :

• According to Jain tradition, there were 24 Tirthankaras. Rishabha was the first Tirthankara and Vardhaman Mahavira was the 24th Tirthankara.

• Mahavira was born in 540 BC Kundagrama near Vaishali, and left his home at the age of 30.

• At the age of 42, he attained the highest spiritual knowledge called Kevala-Jnana.

• As per Jainism way to Nirvana is also known as Three Ratnatraya involves Right faith, Right knowledge and Right conduct.

• Five carinal principles of Jainism are Ahimsa, Non-Lying, Non-Stealing, Non-Possession, and Brahmacharya. 

• Later divided into two sects: Swethembaras and Digambaras.

➤Five vows of Jainism :

• Ahimsa – non-violence

• Satya – do not speak a lie

• Asteya – do not steal

• Aparigraha – do not acquire property

• Brahmacharya – celibacy

➤Three main principles :

• Ahimsa

• Anekantavada

• Aparigraha

➤Triratna’s of Jainism :

• Right faith – Samayak Shradha

• Right Knowledge – Samayak Jnan

• Right Conduct – Samayak karma

➤Five types of knowledge :

• Mati jnana

• Shruta jnana

• Avadhi jnana

• Manahparayaya Jnana

• Keval Jnana

➤Jain council :

• 1st Council at Patliputra under the Patron of Chandragupta Maurya in 300 BC during which the 12 angas were compiled

• 2nd Council at Vallabhi in 512 AD during which the final compilation of 12 angas and 12 upangas was done

➤Sects :

• Shwetambars – Sthulabhadra – People who put on white robes. Those who stayed back in the North during the times of famine

• Digambars – Bhadrabahu – Exodus of monks to Deccan and South during the times of Magadhan famine. They have a naked attire

➤Jain Literature :

Jain literature used Prakrit, which is a common language of people than using Sanskrit. In this way, Jainism reached far and wide through people. The important literary works are

• 12 Angas

• 12 Upangas

• 10 Parikramas

• 6 Chhedsutras

• 4 Mulasutras

2 Sutra Grantas

• Part of Sangam literature is also attributed to Jain scholars.

 

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Notes on mauryan empire

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Rise of maratha Empire

History Notes: Rise of Maratha Empire
➤Maratha Empire

• The geographical condition of Maharashtra helped in the rise of the Maratha empire.

• It’s an important episode of Indian history.

• Most of the region of Maharashtra had plateau region plateau also provided a good facility for guerilla-warfare to the Maratha.

• The rise of the Maratha empire was the result of the efforts of the entire Maratha people who on the basis of unity of their languages, literature, community, and homeland gave birth to Maratha nationalism and desired to create an independent state of their own.

• The saints of the Bhakti Movement in Maharashtra had also played an important role.
➤Chhatrapati Shivaji Maharaj

• Shivaji was born in 1627. In fort of Shivneri

• He was the son of Shahji Bhonsle and Jija Bai.

• Shivaji inherited the Jagir of Poona from his father in 1637.

• After the death of his guardian, Dadaji Kondadev, in 1647, he assumed full charge of his Jagir.

• His guru was Ramdas Samrath

• He conquered many Forts viz., Singh Garh/ Kondana (1643), Rohind and Chakan (1644-45), Toran (1646), Purandhar (1648), Rajgarh/ Raigarh (1656), Supa (1656), Panhala (1659).

• In 1657 Shivaji first confronted the Mughals, talking advantage of the Mughal invasion of Bijapur, he raided Ahamadnagar and plundered Junnar.

• In 1659-60, Afzal Khan was deputed by Adil Shah of Bijapur to punish Shivaji; but the later Afzal Khan was murdered by Shivaji in 1659. The famous ―baghnakh‖ episode is related with the death of Afzal Khan.

• In 1660, Shaista Khan, governor of Deccan, was deputed by Aurangzeb to check Marathas. Shivaji lost Poona, Kalyan and Chakan also suffered several defeats till he made a bold attack on Shaista Khan(1663) and plundered Surat (1664) and later Ahmadnagar.

• Raja Jai Singh of Amber and Diler Khan were then appointed by Aurangzeb to curb the rising power of Shivaji in 1665.

• Jai Singh succeeded in besieging Shivaji in the fort of Purandhar. Consequently the treaty of Purandhar (1665) was signed according to which Shivaji ceded some forts to the Mughals and paid a visit to the Mughal court at Agra.

• 1666, Shivaji visited Agra but there he was insulted.

• 1670, Shivaji captured most of the forts lost by the treaty of Purandhar.

• 1674 Shivaji was coroneted at capital Raigarh and assumed the title of Haindava Dharmodharak (Protector of Hinduism).

• After that Shivaji continued the struggle with Mughals and Siddis (Janjira). He conquest Karnataka during 1677-80.

• His last expedition was against Ginjee and Vellore.

➤Successors of Shivaji

  1. Shambhaji (1680-1689)-

• Sambhaji, the elder son of Shivaji, defeated Rajaram, the younger son of Shivaji, in the war of succession.

• He provided protection and support to Akbar II, the rebellious son of Aurangzeb.

• He was captured at Sangameswar by a Mughal noble and executed(killed).

  1. Rajaram (1689-1700)-

• He succeeded the throne with the help of the ministers at Rajgarh.

• He fled from Rajgarh to Jinji in 1689 due to a Mughal invasion in which Rajgarh was captured along with Sambhaji‘s wife and son (Shahu) by the Mughals.

• Rajaram died at Satara, which had become the capital after the fall of Jinji to Mughal in 1698.

• Rajaram created the new post of Pratinidhi, thus taking the total number of the minister to nine (Pratinidhi+Ashtapradhan).

  1. Tarabai(1700-1707)-

• Rajaram was succeeded by his minor son Shivaji II under the guardianship of his mother Tarabai.

• Tarabai continued the struggle with Mughals

  1. Shahu (1707-1749)-

• Shahu was released by the Mughal emperor Bahadur Shah.

• Tarabai‘s army was defeated by Shahu at the battle of Khed (1700) and Shahu occupied Satara.

• Shahu‘s reign saw the rise of Peshwas and the transformation of the Maratha kingdom into an empire based on the principle of the confederacy.

  1. Balaji Viswanath (1714-20)=The First Peshwa

• He began his carrier as a small revenue official and was given the title of Sena Karte (a marker of the army) by Shahu in 1708.

• Balaji became Peshwa in 1713 and made the post the most important and powerful as well as hereditary.

• He concluded an agreement with the Syed Brothers-King Maker (1719) by which the Mughal emperor Farrukhsiyar recognized Shahu as the king of the Swarajya.

  1. Baji Rao-I (1720-40)-

• Baji Rao, the eldest son of Balaji Viswanath, succeeded him as Peshwa at the young age of 20.

• He was considered the greatest exponent of guerrilla tactics after Shivaji and Maratha’s power reached its zenith under him.

• Under him, several Maratha families became prominent and got themselves entrenched in different parts of India.

• He conquered Bassein.

• Baji Rao-I also defeated the Nizam-ul-Mulk near Bhopal and concluded the treaty of Doraha Sarai by which he got Malwa and Bundelkhand from the latter (1738).

• Baji Rao-I said about Mughals: Let us strike at the trunk of the withering tree and the branches will fall of themselves‘

  1. Balaji Baji Rao(1740-61)-

• Popularly known as Nana Saheb, he succeeded his father at the age of 20.

• After the death of Shahu (1749), the management of all state affairs was left in his hands.

• In an agreement with the Mughal emperor Ahmad Shah, the Peshwa was to protect the Mughal empire from internal and external enemies (like Ahmad Shah Abdali) in return for Chauth (1752).

• The third battle of Panipat (Jan 14, 1761) resulted in the defeat of the Marathas by Ahmad Shah Abdali and the death of Viswas Rao & Sadashiv Rao Bhau. This event shocked the Peshwa Balaji Baji Rao and after six months he also died. This battle ended the Maratha power.

➤Anglo Maratha Wars:

  1. First Anglo -Maratha War (1775-1782)

The British fought in favour of Peshwaship to Raghunath Rao. The English (under Hastings) were defeated by the Marathas. They had to sign the Convention of Wadgaon in 1779, which was humiliating for the British. The English later signed the Treaty of Salbai in 1782 where they renounced their cause of Peshwaship for raghoba.

  1. Second Anglo – Maratha War (1803- 1806)

The Maratha Peshwa Baji rao II signed the Subsidiary Alliance Treaty of Bassein in 1802. Other Maratha chief who were part of Maratha confederacy, were not happy due to this arrangement. The Scindias of Gwalior began the war against the British but they were defeated by the British.

  1. Third Anglo – Maratha War (1817-1818)

It is also known as Pindari war. Lord Hastings was determined to proclaim British paramountcy in India. Hastings moved against Pindaris which transgressed the sovereignty of the Maratha chiefs and the war began. The Marathas were defeated.



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World Environment day 2021

World Environment Day 2021
The World is celebrating World Environment Day today i.e. 5th June 2021. Every year a different country host an event on this day to celebrate the beautiful presence of mother nature and to raise awareness about the various human activities that are disrupting the harmonious balance of life around us.

“World Environment Day, it’s Time for Nature”

This quote sets the tone and defines the purpose behind celebrating the day. United Nations first celebrated World Environment Day in 1974. Since then, the UN celebrates this day on 5th June of every year to raise awareness about the environmental issue world is facing today such as human overpopulation, global warming, marine pollution, wildlife crimes, desertification etc. 

➤History of the World Environment Day

World Environment Day was established by the UN General Assembly in 1972 on the first day of the Stockholm Conference on the Human Environment, resulting from discussions on the integration of human interactions and the environment. Two years later, in 1974 the first World Environment Day was held with the theme “Only One Earth”. Even though the celebration has been held annually since 1974, in 1987 the idea for rotating the centre of these activities through selecting different host countries began.

Note: India hosted World Environment Day on 5th June 2018. The theme of the day was “Beat the Plastic Pollution.” 

➤World Environment Day 2021

Every year a different country host this prestigious day. This year’s World Environment Day is being hosted by ‘Pakistan’ in partnership with the UN Environment Programme (UNEP). The event has become the platform for reaching out and engaging governments, NGOs, corporations, businesses, celebrities and citizens to focus their efforts on a pressing environmental issue. The theme for World Environment Day 2021 is “Ecosystem Restoration” and will see the launch of the UN Decade on Ecosystem Restoration. Ecosystem restoration can take many forms: Growing trees, greening cities, rewilding

What is Ecosystem restoration?



Ecosystem restoration means assisting in the recovery of ecosystems that have been degraded or destroyed, as well as conserving the ecosystems that are still intact. Healthier ecosystems, with richer biodiversity, yield greater benefits such as more fertile soils, bigger yields of timber and fish, and larger stores of greenhouse gases.

Restoration can happen in many ways – for example through actively planting or by removing pressures so that nature can recover on its own. It is not always possible – or desirable – to return an ecosystem to its original state. We still need farmland and infrastructure on land that was once forest, for instance, and ecosystems, like societies, need to adapt to a changing climate.

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Continents and Oceans

The Earth – Shape and Size

Shape of the Earth

Pythagoras (572-500 B.C.), a Greek philosopher and mathematician, was among the first to suggest that the Earth was shaped like a globe.

The Earth is not flat

1.    If the Earth were a flat disc, then the rising Sun would have been seen at all places at the same time. But this does not happen. Places in the east see the rising Sun earlier.

2.    When a ship approaches land, its funnel or mast is seen first and then the hull. If the Earth had been flat, the whole ship would have been seen at the same time.


The Earth is a sphere

1.    The Earth is rarely oriented in the same position during successive eclipses but it always casts a circular shadow, thus proving that the Earth is a sphere. A sphere is the only solid body that will always cast a circular shadow.

2.    At the North Pole, the Pole Star can always be observed at 90 degrees in the sky, since the star lies in the line with the axis of the Earth.

3.    As one travels southwards, the angle of Pole Star decreases.

4.    At the Equator the angle becomes zero degree.

5.    This observation proves that the path of travel is an arc of a circle.

6.    The Sun, Moon and all the heavenly bodies appear to be spherical when viewed from different positions. It seems logical to conclude that the Earth is no exception.

7.    The photographs of the Earth taken from the space prove beyond any doubt that the Earth is a sphere.


The Earth as an Oblate Spheroid

1.    Refined measurements of the Earth have proved that the true form of the Earth resembles a sphere that has been compressed at the poles and made to bulge at the Equator. This form is known as an oblate spheroid.

2.    The various factors which make the earth suitable for

3.    life to evolve and survive are

4.    The earth has all the essential elements like carbon (in the form of C02), hydrogen (H2), nitrogen (N2) and oxygen (02) which act as building blocks for the origin of life.

5.    The earth is neither too hot nor too cold. It has the right temperature range for carrying out the life-sustaining chemical reactions.

6.    The earth has a lot of water in the form of lakes, rivers and oceans for the growth and survival of life.

7.    The earth has enough oxygen gas in its atmosphere for the survival of living beings through breathing.

8.    The earth has a protective blanket of ozone layer high up in its atmosphere to save life from harmful ultraviolet radiations coming from the sun.


Oceania

Australia with New Zealand, Tasmania, New Guinea and the Pacific Islands (Micronesian, Melanesian and Polynesian Islands) is called Australasia by some geographers while some others call it “Oceania”, which includes proximate islands (Caribbean countries etc.).


Oceans on The Earth

There are four oceans. In order of their size, they are : Pacific Ocean, Atlantic Ocean, Indian Ocean and Arctic Ocean.


Pacific Ocean

1.    The explorer Ferdinand Magellan, who circumnavigated the Earth, named the ocean “Pacific” meaning calm or peaceful.

2.    The Pacific Ocean (Area : 166,240,000 sq. km.) is the largest ocean of the world.

3.    It is the deepest ocean with an average depth of 4,200 m.

4.    The Mariana Trench is the world’s deepest trench with a depth of 11,033 metres (36,201 feet).

5.    Most of the islands of this ocean are of volcanic or coral origin.


Atlantic Ocean

1.    The Atlantic Ocean (Area : 86,560,000 sq. km.) is the second largest ocean in the world

2.    Its name is derived from Atlas, a Titan (giant) in Greek mythology.

3.    The Atlantic Ocean has the longest coastline.

4.    The Atlantic Ocean is the busiest ocean for trade and commerce since its shipping routes connect the two most industrialized regions, namely Western Europe and N.E. United States of America.

5.    The Atlantic Ocean was formed millions of years ago when a rift opened up in the Gondwanaland and the continents of South America and Africa separated. The separation continues even today and the Atlantic Ocean is still widening.

6.    The continental islands of Newfoundland and British Isles are the major ones.

7.    Volcanic islands are fewer and they include those of Cuba, Jamaica and Puerto Rico. Iceland is the largest island of volcanic origin.


Indian Ocean

1.    The Indian Ocean (Area : 73,430,000 sq. km.) is the only ocean named after a country.

2.    The Indian Ocean is deeper than the Atlantic Ocean.

3.    It contains numerous continental islands, Madagascar and Sri Lanka are being the largest ones.

4.    Some of the islands of volcanic origin are those of Mauritius, Andaman and Nicobar, Seychelles, Maldives and Lakshadweep are of coral origin.


South Indian Ocean

1.    Warm currents : 1. South Equatorial 2. Mozambique 3. Madagascar 4. Agulhas.

2.    Cool Currents : 1. Antarctic drift 2. West Australian currents.


Arctic Ocean

1.    The Arctic Ocean (Area : 13,230,000 sq. km.) is the smallest of all the oceans.

2.    It lies within the Arctic Circle, hence the name Arctic Ocean.

3.    The North Pole lies in the middle of the Arctic Ocean.

4.    Most of the parts of Arctic Ocean remains frozen with thick ice for most of the days every year.

5.    It is the shallowest of all oceans, with an average depth of 1,500 m.

6.    It has the least salinity of all the oceans. It has a salinity of 20 unit per thousand.


Ocean Currents

1.    The flow of a large amount of water in a definite direction with a great intensity is known as Ocean Current.

2.    Ocean Currents are of two types-Hot and Cold.


Hot Currents

1.    The currents flowing from tropical zones of lower latitudes to higher temperate and sub polar zones are known as hot water currents.


Cold Currents

1.    The currents flowing from higher latitudes to lower latitudes are known as cold water currents.
2.    The only exception to the conduction of ocean currents is found in the Indian Ocean. The flow of currents changes here with a change in the direction of the Monsoon Winds. The hot currents flow towards cooler oceans and the cold currents flow towards the warmer oceans.

 

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Important Scientific Instruments and their usage

Important Scientific Instruments and their usage
 



Accumulator

It is used to store electrical energy

Altimeter

It measures altitudes and is used in aircraft.

Ammeter

It measures the strength of electric current (in amperes).

Anemometer

It measures the force and velocity of the wind.

Audiometer

It measures the intensity of sound.

Audiphones

It is used for improving the imperfect sense of hearing.

Barograph

It is used for continuous recording of atmospheric pressure.

Barometer

It measures atmospheric pressure.

Binocular

It is used to view distant objects

Bolometer

It measures heat radiation

Calorimeter

It measures the quantity of heat.

Carburettor

It is used in an internal combustion engine for charging the air with petrol vapor.

Cardiogram

It traces movements of the heart, recorded on a cardiograph.

Chronometer

It determines the longitude of a place in a ship.

Cinematography

It is an instrument used in cinema making to throw on screen and enlarged image of the photograph.

Colorimeter

An instrument for comparing intensities of colour.

Commutator

An instrument to change or remove the direction of an electric current, in dynamo used to convert alternating current into direct current.

Cresco graph

It measures the growth in plants.

Cyclotron

A charged particle accelerator which can accelerate charged particles to high energies.

Dynamo

It converts mechanical energy into electrical energy

Dynamometer

It measures force, torque, and power

Electroscope

It detects the presence of an electric charge.

Endoscope

It examines the internal parts of the body.

Eudiometer

A glass tube for measuring volume changes in chemical reactions between gases.

Fathometer

It measures the depth of the ocean.

Galvanometer

It measures the electric current of low magnitude.

Hydrometer

It measures the specific gravity of liquids.

Hydrophone

It measures sound under water.

Hygrometer

It measures humidity in the air.

Kymograph

It graphically records physiological movements (Blood pressure and heartbeat).

Lactometer

It determines the purity of milk.

Manometer

It measures the pressure of gases.

Mariner’s compass

It is an instrument used by the sailors to determine the direction.

Microphone

It converts the sound waves into electrical vibrations and to magnify the sound.

Microscope

It is used to obtain a magnified view of small objects.

Odometer

An instrument by which the distance covered by wheeled vehicles is measured.

Periscope

It is used to view objects above sea level (used in submarines)

Phonograph

An instrument for producing sound.

Photometer

The instrument compares the luminous intensity of the source of light

Potentiometer

It is used for comparing the electromotive force of cells.

Pyrometer

It measures very high temperature.

Quartz Clock

A highly accurate clock used in astronomical observations and other precision work

Radar

Radio, angle, detection and range is used to detect the direction and range of an approaching aeroplane by means of radio micro waves

Radiometer

It measures the emission of radiant energy.

Rain Gauge

An apparatus for recording rainfall at a particular place.

Rectifier

An instrument used for the conversion of AC into DC.

Refractometer

It measures refractive index.

Saccharimeter

It measures the amount of sugar in the solution.

Salinometer

It determines salinity of solution.

Seismograph

It measures the intensity of earthquake shocks.

Sextant

This is used by navigators to find the latitude of a place by measuring the elevation above the horizon of the sun or another star.

Spectrometer

It is an instrument for measuring the energy distribution of a particular type of radiation.

Spectroscope

An instrument used for spectrum analysis

Speedometer

It is an instrument placed in a vehicle to record its speed.

Spherometer

It measures the curvatures of surfaces.

Sphygmomanometer

It measures blood pressure.

Stereoscope

It is used to view two dimensional pictures.

Stethoscope

An instrument which is used by the doctors to hear and analyse heart and lung sounds.

Stroboscope

It is used to view rapidly moving objects.

Tachometer

An instrument used in measuring speeds of aero planes and motor boats.

Teleprinter

This instrument receives and sends typed messages from one place to another.

Telescope

It views distant objects in space.

Theodolite

It measures horizontal and vertical angles.

Thermometer

This instrument is used for the measurement of temperatures.

Thermostat

It regulates the temperature at a particular point.

Transistor

A small device which may be used to amplify currents and perform other functions usually performed by a thermionic valve

Udometer

It is used to measure the amount of liquid precipitation over a set period of time. It is also called Rain Gauge.

Vernier

An adjustable scale for measuring small subdivisions of scale

Viscometer

It measures the viscosity of liquids.

Voltmeter

It measures the electric potential difference between two points.

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