![]() Once you prove that the gravity arm is restored every thirty seconds, then pursue adding the pilot dial into the series circuit. I have added a picture below to show the basic basic circuit to show how simple the circuit can be. The production most likely varied each year, and also a clock bought in 1923 may well have been made in 1922, or even 1921 maybe. You may find connections inside the right hand side of the case near the top, two fahnstock or other terminals to connect the battery. The records of serial numbers no longer exist, so there are several attempts by owners to catalogue numbers from eBay adverts and else where on the web, in the hope of getting an accurate dating chart. Three or four "D" size flashlight cells in series is usually ample. Generally with only the pilot dial and no slaves, only three or four volts is suitable provided there is minimal DC resistance in the battery or wires. The battery voltage is not important because the time transmitter and all connected slaves (the pilot dial is a slave) are in a series "loop circuit" with the battery. The design of the master which is often simply called a "time transmitter" provides for a brief electrical circuit closure every thirty seconds using a battery to provide 300 milliamperes current (one third of an ampere) when the circuit closes. ![]() The Hope-Jones Synchronome is exceedingly simple in principle as well as electrically.
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