Standard Electric Time Master Clock

Discussion in 'Electric Horology' started by susan wood, Jan 23, 2020.

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  1. susan wood

    susan wood Registered User
    NAWCC Member

    Jan 14, 2020
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    A friend is reviving a 1929 school master clock with mercurial pendulum and a 4 circuit (two tapes) program clock. The tapes are missing. The tapes are 12 hour program tapes for Standard Electric Time Master Clocks. Has any one made these tapes and would share the exact dimensions or is there a source to purchase them?
     
  2. mxfrank

    mxfrank Registered User

    Oct 27, 2011
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    The tapes are 1" wide. Drive holes are spaced 5/8". On my 24 hour program clock, total length of each loop is about 150". These come up on E-bay from time to time, I'm not sure if there's a modern substitute.
     
  3. susan wood

    susan wood Registered User
    NAWCC Member

    Jan 14, 2020
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    Thank you mxfrank,
    my friend calculated the tape length for the 12 hour tape to be 75.398 inches, so your estimate of about twice that for a 24 hour tape gives him confidence to go forward with his own project.

    You say the sprocket holes are 5/8” apart. He gets 6.283, so, again, that’s pretty close.

    He made a CAD program to produce the 12 hour tape in 6, 2 hour segments on one sheet of 8 ½ X 14 copy paper, then laboriously cut and taped the segments together, but has yet to hand punch (with an old pliers-type leather punch) all 60 holes, so he can try it out.

    If it works out, he'd be glad to offer paper copies of the CAD image, or even the TurboCAD file itself to anyone interested in making their own.
    Thanks again.
     

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