'How to build a two valve set', No 18, Godfrey Philips cigarette card, 1925.

'How to build a two valve set', No 18, Godfrey Philips cigarette card, 1925.
2 4 c m
40cm
actual image size: 32cm x 16cm

Description

The reverse of the card reads: 'Grid Bias Leads. Two lengths of coloured insulated wire, one 6 inches long (black), and one 9 inches long (red) are fixed to black and red "wander" plugs (Lisenin Positive Grip). The other end is joined to the terminal which is marked "Grid Bias". The red wire is similarly screwed under the filament terminal of the first valve holder to which the earth terminal is connected.'

Image Details

Image Ref.
 
10421565

© Science Museum / Science & Society Picture Library

buy a print

Select size
 
Select finish
 
How many prints?
 
£20.00
 

buy a framed print

buy a canvas

buy a framed canvas