Accession No

1394

Brief Description

omograph for compounding sine-versine curves, c.1940

Origin

Maker

Class

drawing

Earliest Date

1940

Latest Date

1940

Inscription Date

Material

wood (mahogany and one other); plastic; metal (brass, steel); paper; rope (string)

Dimensions

box length 962mm; breadth 400mm; height 160mm

Special Collection

Provenance

Inscription

‘OMOGRAPH FOR
COMPOUNDING “SINE-VERSINE” CURVES
bequeathed to the UNIVERSITY OF CAMBRIDGE
-BY-
SIR THOMAS WRIGHTSON BT.
author of
“MECHANISM OF THE INNER EAR.”’ (on box)

Description Notes

Mahogany frame; ‘table top’ with two graduated plastic dials divided 0 - 360˚ by 15˚; double-ended brass pointers attached to system of cogs and levers below ‘table top’. And by strings to 3 parallel sliding arms, connected by crosspieces, with clamped pencil points. Rollers below for paper feed. Steel handle for rotating pointers and turning rollers.
Fitted wooden box.
Box of lead pencils; spare cog. Paper rolls, one with sine curves.

Condition

References

Events