3 3 c m
40cm
actual image size: 32cm x 25cm
Description
Sector pattern switchboard wattmeter. Made by Metropolitan Vickers. The wattmeter measures the power disipated in an electrical circuit. The need to measure power rose with the growth of the electricity supply network in the late 19th century.
Image Details
Image Ref.
10207915
© Science Museum / Science & Society Picture Library