How to build a two valve set', No 10, Godfrey Philips cigarette card, 1925.

How to build a two valve set', No 10, Godfrey Philips cigarette card, 1925.
2 4 c m
40cm
actual image size: 32cm x 16cm

Description

The reverse of the card reads: 'Inside of Cabinet. The cabinet may be as simple or elaborate as taste and pocket decree. Oak or mahogany is suitable, and the material should be 1/4 inch thick. The 5 ft length of 7 1/2 in wood is sufficient to make a cabinet with plain butt joints fixed with No 1 screws. The illustration shows how the grid bias battery (9 volt) is secured to the back of the cabinet. Two large washers being used to enable the 1 1/3 in No 6 screws to hold the battery in position.'

Image Details

Image Ref.
 
10421647

© 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