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Single phase service type meter

Single phase service type meter

Meter for measuring electrical interruptions per second

Meter for measuring electrical interruptions per second

1920-1935
Heydes Aktino Photo Meter

Heydes Aktino Photo Meter

1905
Acoustic Impedance Meter

Acoustic Impedance Meter

1965-1980
Main body with propeller from recording current meter designed by Jonas Ekman Fjeldstad

Main body with propeller from recording current meter designed by Jonas Ekman Fjeldstad

1953
Alternate current Watt hour meter no.31031

Alternate current Watt hour meter no.31031

Meter, wood surround

Meter, wood surround

1801-1850
Engine Speed Meters

Engine Speed Meters

1947-1955
Electro-Acoustic Impedance Meter, model ZO70, by Madsen Electronics, Ontario, Canada. 1965-1980.

Electro-Acoustic Impedance Meter

1965-1980
Acoustic Impedance Meter, model AP61c with carrying case, by Peters, Sheffield, England, 1970-1980.

Acoustic Impedance Meter

1970-1980
Sewerage Meter, 12 inch venturi (throat ratio 1:5 3/8 no 3857, by George Kent & Co. Ltd. (1933)

Sewerage meter by George Kent & Co. Ltd.

1933
Electro-Acoustic Impedance Bridge, model ZO72, by Madsen Electronics, Ontario, Canada, 1965-1980.

Electro-Acoustic Impedance Bridge

1965-1980
Two oxygen flow meters, designed for cutting, bought for use in special baby care unit at Horton General Hospital c1961, by BOC, in original carton

Two oxygen flow meters

1961