Plotting rule by E.R. Watts & Son London

Made:
1920-1940 in London
maker:
E. R. Watts & Son
Plotting rule by E.R

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Plotting rule by E.R
Science Museum Group
© The Board of Trustees of the Science Museum

Plotting rule by E.R. Watts & Son London, marked H O [arrow] 221, cased.

Details

Category:
Meteorology
Object Number:
1997-1440
Materials:
brass and wood
Measurements:
rule: 46 cm
type:
plotting rule
credit:
Meteorological Office