Archive of Collections

Details and Image

TypeModel No.MakerCountryConstruction
DateScale LengthArea of Use
Dubilier Capacity Electronic poly-slide (2)
John Davis & Son (Derby) Ltd.Great Britain
Celluoid on Wood
192825 cmElectrical

Notes: "Dublilier Capacity Rule designed for electrical R, L, C frequency calculations, designed by Philip R. Coursey, note the 2 slides"

Image 1

Image 2

Image 3