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148 
Keeping a Check on the Vehicle's Movements
Page 104
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HAIJLIERS and ancillary users are making increased use of recording instruments. The need for keeping a watchful eye on running expenditure and drivers' hours has led to the development of devices which can show at a glance the movements of the vehicle over various periods.
Prominent among the various makes of recorder is the Zenith, a product of MeSsrs. Zenith Time Recorders, 55, Castleton Avenue, Wembley, and the 658
instrument is capable of covering several different periods of operation.
It is of simple design and it is strongly built. It incorporates a Zenith eight-day clock movement and the recording mechanism is of the oscilla
tory type. The charts are made of coloured paper, which is given a fine, white coating, so that when the vehicle is in motion the os-cillator needle removes the coating and marks the chart. During rest periods, a fine line is marked on the chart, this becoming thicker when the engine is started and developing into a band when the vehicle is in operation. For recording over eight-day periods, eight one-day charts are joined together in the form of a spiral, and, by this means, a continuous record of the vehicle's movements over eight periods of 24 hours is obtained without changing the chart or altering the instrument.