3 1 c m
40cm
actual image size: 32cm x 23cm
Description
One of six line drawings with colour wash by J Farey, of William Fothergill Cook's (1806-1879) specification for 'Improvements in giving signals and sounding alarums at distant places by means of Electric Currents transmitted through metallic Circuits'. This is Sheet A of the Second English specification. The patent was sealed 18 April 1838.
Image Details
Image Ref.
10317767
© Science Museum / Science & Society Picture Library