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  1. M

    Electric Clocks Sparks and Arcs

    Actually, a better bet would be a combination of a resistor and a diode in series. The diode would block forward flow, but allow the reverse kick to dissipate. The resistor would dissipate energy faster. Describing this as happening at the speed of light is misleading, it's a relatively slow...
  2. M

    Electric Clocks Sparks and Arcs

    Sorry, my error. Try this one: https://www.arrow.com/en/products/p6ke39ca/eic-semiconductor Whatever device you use is usually connected across the coil, but it could also be connected across the switch. If it's across the switch, some consideration is needed to avoid or reduce leakage when...
  3. M

    Electric Clocks Sparks and Arcs

    You can use a bid directional TVS (transient voltage suppressor). These are specialized diodes that "clamp" at a threshold voltage. If you're switching 24V, you can use a 30V TVS, which would shunts surge current before voltage rises high enough to spark. The advantage is that you don't have...
  4. M

    Quiet Relay?

    Again, HVAC systems typically have 24VAC control voltage, so lots of options. I thought you were trying to switch 24VDC with a w4VAC signal, but if not: https://www.grainger.com/product/CRYDOM-Solid-State-Relay-1DTH6
  5. M

    Self Winding Clock Company- Western Union

    Doesn't mean anything. When the movements were exchanged, the case tags were also supposed to be exchanged. This clock was likely deployed in the 30's or 40's, and this style went to end of the WU time business in the early 60's. Here is a snip from the service manual: Ken has put up a...
  6. M

    Quiet Relay?

    Sealed relays are used for 24VAC HVAC and Alarm applications. Any of them will be almost inaudible inside a clock case: https://www.parts-express.com/nte-r40-11d2-24-2a-24-vdc-dpdt-security-relay-pcb--075-136 https://www.grainger.com/product/WHITE-RODGERS-Magnetic-Relay-1N185
  7. M

    Self Winding Clock Company- Western Union

    The syncronizer is not needed for the clock to work and keep time. It's actually as accurate as any decent gallery clock stand alone, without the syncronizer. As for age, the F style movement goes back to the 1880's, but was produced for 70 years. This style of clock was typical of the 1940's...
  8. M

    GE "Hotel" World Clock questions

    There are many of these on E-Bay. Maybe a parts clock is the cheapest solution.
  9. M

    GE "Hotel" World Clock questions

    Household timers were used to turn appliances on and off. You could use this to control a lamp when you go on vacation, or to turn on a coffee pot in the morning. The appliance you want to control connects to the socket. I believe the levers around the face control the on and off times.
  10. M

    E. Howard watchmans clock

    NAWCC had reprinted one or two of them, and you find the reprints on E-Bay from time to time. You might call down to the Nawcc Library in Colombia, PA and see what they have. There's an extensive collection of documents at the Smithsonian, some of which are available online: E. Howard Clock...
  11. M

    E. Howard watchmans clock

    I know...odd. Here's a page from an mid-1890's catalog. The 89 was always 20 inches wide, but seems to have lost about six inches of gingerbread somewhere along the way. However, the faces were always 12".
  12. M

    E. Howard watchmans clock

    Here's a photo of my #89. It's 59"x20", with a 12" face. I see various clocks online designated as 89's, but with more ornamentation. I'm always wondering if these were optional ornaments, period variations, or misattributed model numbers.
  13. M

    E. Howard watchmans clock

    First of all, is this really a #89? I can't tell from the photos, but it seems a bit wider and shorter than the usual 89. At one time, they sold #26 and #37 watch clocks, not sure if they consolidated everything to the 89 case later on: https://amhistory.si.edu/media/NMAH-AC0776-07-01.pdf And...
  14. M

    Electric movement

    United Clock Company of Brooklyn. I assume it's a novelty clock of some sort? It should be a 60 cycle synchronous motor. And it's not always easy to find a replacement, so I doubt someone swapped in a 50 cycle motor. The problem is probably elsewhere, and you should start by disassembling and...
  15. M

    American TELEGRAPHIC TIME CO REGULATOR

    It's not commutated like a modern PM motor, it's more of a sequential stepper. The three contact points are arranged so that they make/break in sequence as the rotor turns. Each contact set controls one of the coils, so the magnetic field sort of rotates. The rotor is a brass cage with iron...
  16. M

    Not a Eureka, a United Clock Company Animated Clock

    So a couple of posts about United and Sessions today made me take this off the shelf and get it running again. it's a Eureka-alike clock from United. Probably dates form the fifties. Considering these were cheap clocks, the engineering strikes me as being special. The synchronous motor, which...
  17. M

    Fred Frick self winding master clock movement

    I would guess the small coil is intended to soak up the inductive surge which occurs when the coils are disconnected from power. If that's the case, it will be wired across the power leads to the coils.
  18. M

    SWCC SWCC master / slave difference

    Master SWCC clocks are uncommon. Most of the smaller clocks were synchronized to Naval Observatory time by Western Union. And the larger clocks tended to be used for high accuracy stand alone applications, a jeweler's shop for instance. A master isn't usually sync'd to another time source...
  19. M

    Self-Winding Master Question

    Yet the two installations seem very similar: gauge of metal, spacing of screws, mitered corners, position on the rod. And both on clocks of the same class, if not the same model. As if it was a manufactured part for field installation, or hand made by the same hand.
  20. M

    Self-Winding Master Question

    I wonder if these were field installations. In these photos, they appear to be installed off the center axis, which doesn't seem like something a factory would do.

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Rockford's early high grade movements by Greg Frauenhoff