'How to build a two valve set', No 7, Godfrey Philips cigarette card, 1925.

'How to build a two valve set', No 7, Godfrey Philips cigarette card, 1925.
2 4 c m
40cm
actual image size: 32cm x 16cm

Description

The reverse of the card reads: 'Fixing reaction condenser. This small variable condensor has a capacity of .0001 micro farad and is made by Mesrs. Ormond Ltd. It is fixed in a similar manner to the tuning condensor. The control knob, which has a pointer fixed to is, is secured on the spindle by a grub screw, which is tightened up by screws as shown. The instrument has two sets of fixed vanes, these should be connected together with a length of tinned copper wire, as is used to wire up the other components, the two ends being secured under the nuts which hold on the end plate.'

Image Details

Image Ref.
 
10421566

© Science Museum / Science & Society Picture Library

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