ID:
47
Maker's Name:
Cambridge instrument Co. Ltd., England
Where made:
England
Dimensions:
20 × 20 × 32 cm
An electrostatic voltmeter following a design by Ayrton and Mather. A beam of light reflected by a mirror acts as the 'needle'.
It could measure DC or AC voltges up to about 10V. It had extremely high impedance but a slow response time measured in seconds.
Details are available in the CIC catalogue entry below.
