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 de-energizing. 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.
