History of Science Museum: Collection Database Search

Record Details

Micrometer Rulings Set, by John Coventry, English, c. 1800

preview image for Micrometer Rulings Set, by John Coventry, English, c. 1800
Inventory Number: 59999
Object Type:
Persons: John Coventry
Date Created: c. 1800
Place Created: England United Kingdom Europe
Accession Number: 1970-101
Brief Description: Set of 9 micrometers encased in a fitted box with pull-off top.  Scales range from 1/10th to 1/10,000th of an inch. Six of them (1/50, 1/100, 1/500, 1/1000, 1/5000, 1/10,000)  are of etched glass set in brass copper alloy, two  of them (1/100, and two scales of 1/50 and 1/100) are etched on Ivory, and one (1/10) is etched in silver.  On each micrometer is engraved the scale magnitude. On the 1/500 one is etched "5000 or 25 Million Squares in an Inch"
Box: wood covered with black fish skin, probably shark skin.
Primary Inscriptions: Written in ink on inside of box: "micrometers given me by John Coventry not long before he died circa 1812 or 13" labelling of individual micrometers "50 100 500 1000 10000 5000 25 million/25[?] inch"
Provenance: Lent to the Museum by the Royal Microscopical Society in 1970. Presented to the RMS by Peter Karel Sartory, 1953
Collection Group: Royal Microscopical Society Collection
Material(s): Wood
Copper Alloy
Height Width Depth Diameter Unit
25 96 42 mm

There are no associated narratives.

Image with multimedia irn 48936Image with multimedia irn 48937Image with multimedia irn 48938Image with multimedia irn 48939

Permalink: http://www.mhs.ox.ac.uk/object/inv/59999