Rubber diaphragm, Europe, 1920-1950
1920-1950
Mensinga diaphragm, London, England, 1950-1954
1950-1954
Carton for ‘Clinocap’ diaphragm, London, England, 1930-1960
1930-1960
'Durex' diaphragm, England, 1955-1970
1955-1970
Set of 12 rubber measuring rings, for 'Clinocap' diaphragms, 1934
1934
Rubber diaphragm
1920-1940
Curved paper diaphragm
1912
Clinocap Diaphragm and Box
1930-1960
Rubber diaphragm
Gas meter diaphragm
Early carbon diaphragm
Diaphragm from Sand Glass, 1890-1950
1890-1950
Diaphragm for Megalethoscope
Iris diaphragm, fitted into square metal plate on metal rod
1900-1980
Commercial gas meter diaphragm in polyacrylonitrile-butadiene rubber on a flat-woven polyamide fabric
1976
Commercial formed gas meter diaphragm in Polacrylo-nitrile-butadiene rubber
1976
Gas meter diaphragm
1976
29 Miscellaneaous Waterhouse Stops
Set of Waterhouse Stops for Dallmeyer Lens
Gas meter diaphragm made from the skin of an East Indian tick-free sheep and dressed with mineral oil
1976