The Eco Magneto Line

A magneto generator at each station, cranked by the watchman to send a signal to the main recorder, provided an extra degree of assurance that the watchman wasn't able to short the circuitry at a convenient location and thereby send his signals. That possibility and the problem of maintaining batteries were the main drawbacks with competitors' systems.  But the rough and uneven nature of the magneto current, along with easily achievable higher peak voltages, allowed use of relatively small coils in the solenoids that drive the registering pins, with the vibrations helping to assure that pins

would not stick in the chart. These factors allowed ECO to design a very dense recorder, packing many stations into a relatively small volume and allowing close spacing of the pins, hence many stations across a relatively small recording chart.  

The Eco Magneto Clock Company became the Eco Clock Company in 1916, and in 1923 consolidated with Newman Clock Company to form Detex Watchclock Corporation. These Eco Magneto products were sold with diminishing frequency well into the 1930s, and even a few in the 1940s.

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Eco Circular Dial : I.D. 501

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Eco Circular Dial : I.D. 500A

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Eco Boston : I.D. 517