| This apparatus is used to determine g by measuring the time of fall of a steel ball through a pre-determined distance. The time taken being less than one second, a centi second/milli second timer capable of measuring the time in fraction of seconds has to be used. Comprises two units each of which is mounted on a plastic which can be clamped on a 12 mm diameter retort rod.Connections are taken out to 4 mm sockets. The solenoid unit has a metal core which facilitates prompt release of the sphere on deenergising. The gate switch comprises a hinged steel plate to hold against an adjustable contact by means of a small permanent magnet, the plate falls away promptly at the impact of falling steel ball. The apparatus is supplied with a solenoid unit, gate switch, Steel Ball 18 mm dia and a stand. with Centi second timer. |
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