image MS_776_401
Image number: RS.17385
Credit: ©The Royal Society

Glass tube




Unknown, Artist

Object type

Archive reference number

Manuscript page number




height (page): 320mm
width (page): 200mm


   > Mechanics

Content object


William Brouncker, Robert Moray and Alexander Bruce conducted a series of experiments in the channel north of Queenborough in March 1663. This figure shows a glass tube used in one of their experiments. The tube was about 23 inches, sealed at the bottom end, A, and bent at the top with a small hole at C. The tube was sunk perpendicularly into the channel. The difference of the weight of salt-water at the surface and at the bottom of the water was measured in relation to the depth of the water. The report was read at the meeting of the Royal Society on 18 March 1663, and was ordered to be registered.

This image is a copy of the one at RBO/2i/208. Another copy can be found at MS/215/086.

This volume is another copy of entries of the first two volumes of the Register Book. It was given to Sir Joseph Banks by G. S. Heales Esquire of Doctor's Common on 31 May 1814.

Object history

At the meeting of the Royal Society on 18 March 1663, ‘The lord viscount Brouncker, Sir Robert Moray, and Mr. Bruce brought in an account of the observations and experiments, which they had lately made upon the river of Chatham; and his lordship promised to add to them some notes of this own. The paper was ordered to be registered’ (Birch 1:208). The figures and text are printed in Birch 1:208-12.

The figure is also printed in R. Hooke, Philosophical experiments and observations (London, 1726), p. 100.

Related Fellows

William Brouncker, 2nd Viscount Brouncker of Lyons (1620-1684, British), Mathematician
Robert Moray (1608-1673, British), Natural philosopher
2nd Earl of Kincardine Alexander Bruce (1624-1680, British), Inventor

Associated place

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