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| ?G? BY FREE FALL APPARATUS
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The free fall apparatus comprises two units, each of which is mounted on a plastic base, which can be clamped on a 13mm diameter retort rod. Connections are brought out to 4mm sockets.
The solenoid unit has a mumetal core, which ensures prompt release of the ball on de-energising. The gate switch unit comprises a hinged steel plate, which is held against an adjustable contact by means of a small permanent magnet, so that, by proper adjustment, the plates fall away promptly at the impact of the falling ball. |
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