A pocket-sized level
Date
27 March 1686
Object type
Archive reference number
Manuscript page number
p336
Material
Dimensions
height (page): 320mm
width (page): 195mm
width (page): 195mm
Subject
Content object
Description
A figure of a pocket-sized level designed by Robert Hooke, in a letter by Thomas Gale to St George Ashe dated 27 March 1686. Although this figure differs considerably from the one found among the papers of the Dublin Philosophical Society (Add. Ms. 4811, 117v, British Library), the principles illustrated here are the same.
This figure is copied from EL/H3/42/001.
This figure is copied from EL/H3/42/001.
Transcription
'...a new Level, whereby he pretends by a very small Instrument, and which may be made almost to be carried in your Pocket to discover the Horizontal Line for all Uses to the utmost Rigour of Exactness.
AB, CD are two Rulers at right Angles, the one to the other. EF is a third erected at right Angles on the Intersection of the other two, but cut away at the bottom, that so the Wire FG may be fasten'd to the Center of the Instrument in F, to give the Axis EF a small Inclination towards C.
Transcribed by the Making Visible project
AB, CD are two Rulers at right Angles, the one to the other. EF is a third erected at right Angles on the Intersection of the other two, but cut away at the bottom, that so the Wire FG may be fasten'd to the Center of the Instrument in F, to give the Axis EF a small Inclination towards C.
Transcribed by the Making Visible project
Related fellows
Thomas Gale (1635 - 1702, British) , Antiquary
St George Ashe (1658 - 1718, British) , Mathematician
Robert Hooke (1635 - 1703, British) , Natural philosopher
St George Ashe (1658 - 1718, British) , Mathematician
Robert Hooke (1635 - 1703, British) , Natural philosopher
Associated place