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Larcum Kendall

Larcum Kendall is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Larcum Kendall rather than just read about it. In short: Larcum Kendall (21 September 1719 in Charlbury, Oxfordshire – 22 November 1790 in London) was a watchmaker from Oxfordshire, who was active in London. Early life Kendall was born on 21 September 1719 in Charlbury.

Larcum Kendall — main illustration
Larcum Kendall — illustration

Key takeaways

  • Larcum Kendall belongs to science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Larcum Kendall to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Larcum Kendall from memory before moving on to harder problems.

Reference excerpt

Larcum Kendall (21 September 1719 in Charlbury, Oxfordshire – 22 November 1790 in London) was a watchmaker from Oxfordshire, who was active in London.

Early life

Kendall was born on 21 September 1719 in Charlbury. His father was a mercer and linen draper named Moses Kendall, and his mother was Ann Larcum from Chepping Wycombe in Buckinghamshire; they married on 18 June 1718. The family were Quakers. The cottage where they lived is thought to be on the site of Charlbury's Amarelo bistro on Market Street. He had a brother, Moses. In 1735 Kendall was apprenticed to the London watchmaker John Jeffreys. He was living with his parents in St Clement Danes at the time. Jeffreys created a pocket watch for John Harrison, who later used ideas from pocket watches in his H4 chronometer. Kendall set up his own business in 1742, working with Thomas Mudge to make watches, working for the watch and clock maker George Graham. In 1765 he was one of six experts selected by the Board of Longitude to witness the operation of John Harrison's H4, which he was subsequently asked to duplicate.

K1 The first model finished by Kendall was an accurate copy of John Harrison's H4, cost £450, and is known today as K1. It was engraved in 1769, and was presented to the Board of Longitude on 13 January 1770, at which point Kendall was given a bonus of £50. Harrison's H4, the first successful chronometer, had cost £400 twenty years prior in 1750, approximately 30% of the value of a ship. James Cook and astronomer William Wales tested the clock on Cook's second South Seas journey aboard HMS Resolution, 1772–75 and, after initial scepticism, returned full of praise. "Kendall's watch has exceeded the expectations of its most zealous advocate", Cook reported in 1775 to the admiralty. Cook also described it in his log as "our trusty friend the Watch" and "our never-failing guide the Watch". (Although constructed like a watch, the chronometer had a diameter of 13 centimetres (5.1 in) and weighed 1.45 kilograms (3.20 lb).) It was thus K1 which proved to a doubting scientific establishment that H4's success was no fluke. Three other clocks, constructed by John Arnold, had not withstood the loads of the same journey. K1 was used again by Cook for his third voyage (HMS Resolution 1776–80). In April 1779 off Kamchatka K1 stopped. A seaman with watchmaking experience cleaned it and started it again, but in June the balance spring broke and it could not be repaired. After its arrival in Britain in September 1780 it was returned to Kendall for repairs. K1 left England in May 1787 with the First Fleet, voyaging to what would become New South Wales in HMS Sirius. K1 was transferred to HMAT Supply in the Indian Ocean, and arrived at Botany Bay on 18 January 1788. After some months ashore with Astronomer Lieutenant William Dawes, K1 was returned to HMS Sirius, which travelled to Cape Town to collect supplies for the Australian colony. After the wreck of Sirius at Norfolk Island in March 1790, K1 was put on board HMAT Supply which went to Batavia to collect more supplies, and eventually took K1 back to England via Cape Horn, arriving in Plymouth in April 1792. K1 went to sea again with Admiral Sir John Jervis in 1793. He took it to the West Indies and the Mediterranean and it was on board HMS Victory at the Battle of Cape St Vincent in 1797. It was finally "pensioned off" to Greenwich in 1802. K1 was described by John Gilbert, Master of the Resolution on Cook's second voyage, as "The greatest piece of mechanism the world has ever seen". K1 is now kept in the Royal Observatory, Greenwich at the National Maritime Museum, Greenwich, England. In 1988 K1 went to Sydney for Australia's Bicentenary and spent some months in Sydney's Powerhouse Museum. In 2007 K1 went to the United States for the "Maps" exhibition in Chicago.

K2 Kendall was asked in 1770 to instruct other workmen on how to manufacture parts for additional replicas of H4; however, he declined stating that further replicas would "still come to so high a price; as to put it far out of the reach of purchase for general use". He assured the Board that he would be able to modify Harrison's design to build a similar but simpler watch for around £200, half the price of K1. He received the order and K2 was manufactured in 1771 (the date inscribed on the watch), and completed in 1772. It was given in 1773 to Constantine Phipps for its expedition towards the North Pole, then it was assigned in North America. It worked less exactly than the original. William Bligh in his 1787 log of HMS Bounty, recorded a daily inaccuracy of between 1.1 and three seconds and that it had varied irregularly. The chronometer attained fame because of the mutiny on the Bounty. The timekeeper was taken by the mutineers following the loss of the Bounty, for which Bligh subsequently apologised to Sir Harry Parker. It returned to England many years later after an odyssey. The American ship's captain Mayhew Folger rediscovered Pitcairn Island in 1808 and was given the chronometer by the one remaining mutineer there, John Adams. The Spanish governor of Juan Fernandez Island confiscated the watch. The chronometer was later purchased for three doubloons by a Spaniard named Castillo. When he died, his family conveyed it to Captain Herbert of HMS Calliope, which sailed from Valparaíso on 1 July 1840, who gave it to the British Museum around 1840. It is now held by the National Maritime Museum in Greenwich, England having previously being held by the Royal United Service Institution's Museum and transferred to the National Maritime Museum in the 1960s. K2 went to Sydney to be part of the Bligh and Mutiny on the Bounty exhibition at the Mitchell Library in 1991.

… excerpt ends here. Continue reading the full article.

Worked examples

Example 1 — a first encounter with Larcum Kendall

Start with the simplest possible case. Write down what Larcum Kendall claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Larcum Kendall before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Larcum Kendall ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Larcum Kendall

In research
Larcum Kendall appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Larcum Kendall in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Larcum Kendall is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1719 births, 1790 deaths, British scientific instrument makers, so understanding it makes those chapters shorter.
In everyday life
Look for Larcum Kendall outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Larcum Kendall in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Larcum Kendall means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Larcum Kendall out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Larcum Kendall in simple terms?

Larcum Kendall (21 September 1719 in Charlbury, Oxfordshire – 22 November 1790 in London) was a watchmaker from Oxfordshire, who was active in London. Early life Kendall was born on 21 September 1719 in Charlbury.

Why does Larcum Kendall matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Larcum Kendall?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Larcum Kendall.

Tags

  • 1719 births
  • 1790 deaths
  • British scientific instrument makers
  • English clockmakers
  • English watchmakers (people)
  • People from West Oxfordshire District

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