CALCULAGRAPH | ||||||||
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Calculagraph Description of Apparatus Operation By pushing the handle A (Figure 1) backwards the lever B is operated. This movement raises the spindle C and causes the printing mechanism to operate the right-hand dial showing the time of day on the card (Figure 2) . On pulling the same handle forward the lever E is depressed, thus pushing the spindle F upward and causing the mechanism to print the two blank left-hand dials (Figure 2) on the card. On the cessation of the call, the ticket is again inserted face downwards and the handle G is pulled forward. This operates the lever H, which in turn raises the disc J and spindles K and L, and prints the two arrows on the two left hand dials, which indicate the elapsed time between the commencement and termination of the call (Figure 3). The left-hand dial and arrow show the number of minutes up to a maximum of 5. Should the duration of the call exceed this, the centre dial, in conjunction with the left-hand one, will show the entire duration of the call. The right-hand dial shows that the call commenced at 1.45 p.m. and the centre and left-hand dials show that it lasted 3.75 minutes.
Figure 1
Figure 2
Figure 3
Taken from Technical Instructions X1, Clocks and Time Distribution (1927) Pictures
Front view
Rear view
Calculagraph in use on a trunk switchboard
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Last revised: July 07, 2023FM2 | ||||||||
This
instrument is employed for the timing of trunk calls at British Post Office telephone exchanges.
