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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
Leather
Copper Alloy
Glass
Ivory
Dimensions:
Height Width Depth Diameter Unit
25 96 42 mm

There are no associated narratives.

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