Slaves were connected in series with the Master clock. The number of slaves was limited by the maximum voltage to use in a system, c. 60 volts. For larger installations one or more “subtransmitting relays” or a “Distribution Board” was used. See under other devices.
An enormous variety of case designs was produced over the years, so here you find only some of the patterns of the movements.
The Fig. C24 Cast iron outdoor slave with double locked movement. Weight:80 pounds, diameter: 24″, coil resistance 8 ohms, made around 1930.
During restoration, it became obvious that the Company didn’t cast these clocks themselves; “PUL-SYN-ETIC” and “ELECTRIC” are bronze labels that were put in the mould before casting.
Silent triangle movements: Earlier versions had a vertical movement, in the beginning even with a bellows to further reduce the noise.
Various seconds slaves: Left: 1930′s, 50 ohms.
Middle: 1950′s, 8,5 ohms.
Right: 1960′s, 3000 ohms, parallel, 24 volts polarized.