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Old 6th Aug 2021, 10:00 am   #1
60 oldjohn
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Default Electric clock c1900

Anyone know anything about my friend's clock, and at the clock restorers at present? On the frame brass frame is stamped PAT'D NOV 21. 1899 PAT'D JULY 31. 1900 B 13306.

The pendulum make a contact on each swing to energise the pair of coils.

Sorry I cannot get any photos at present.


TIA John.
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Old 6th Aug 2021, 10:06 am   #2
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Default Re: Electric clock c1900

Sounds a bit early for Bulle, which is the most common one.
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Old 6th Aug 2021, 7:58 pm   #3
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Default Re: Electric clock c1900

Quote:
Originally Posted by Brigham View Post
Sounds a bit early for Bulle, which is the most common one.

I have had a look at Bulle clock pictures, as you say my friends may pre-date Bulle clocks. This clock has a rectangular wood case and the mechanism is screwed to the top of the case and hangs downwards. The pendulum makes the electric contacts two or three inches below the pivot point of the pendulum. As well as the hour and minutes hands there is another dial with pointer above. There are no numbers on the dial the front is a black and whit geometric design.

John.
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Last edited by 60 oldjohn; 6th Aug 2021 at 8:04 pm.
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Old 24th Aug 2021, 7:37 pm   #4
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Default Re: Electric clock c1900

I have just received the electro magnets removed from the clock. The two are screwed to a metal bar at the top. Each coil is nearly two inches long by about an inch dia with 10mm metal rod former. I think it may be wound with 24DCC copper wire (I can only just see 1mm of the wire as it exits coil) It measures about 3.5 ohms per coil. I do not intend removing the 120 year old cover from the coil to investigate.

Does 7 ohms sound right for an electric clock dating from c1900 ?

TIA John.
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Old 24th Aug 2021, 8:45 pm   #5
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Default Re: Electric clock c1900

A picture paints a thousand words...
 
Old 24th Aug 2021, 11:57 pm   #6
stevenkw2t
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Default Re: Electric clock c1900

an electric pendulum master clock maybe, such as those from Synchronome or Thomas Murday?
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Old 25th Aug 2021, 10:00 am   #7
M0FYA Andy
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Default Re: Electric clock c1900

The sentence "The pendulum make a contact on each swing to energise the pair of coils" is not consistent with the Synchronome design.

Andy
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Old 25th Aug 2021, 10:34 pm   #8
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Default Re: Electric clock c1900

Quote:
Originally Posted by merlinmaxwell View Post
A picture paints a thousand words...
You would not believe the trouble I have had getting the photos but here goes enjoy. The clock case is about 3 ft high. I am unsure of the action of the electromagnet. I am told it sends one of the two weights up to the top??

John.
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Old 26th Aug 2021, 8:15 am   #9
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Default Re: Electric clock c1900

Intriguing, a shot of the movement would be handy. I suspect it is a Hipp toggle clock.
 
Old 26th Aug 2021, 8:44 am   #10
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Default Re: Electric clock c1900

There must be more to this clock than those three pictures show!

Andy
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Old 26th Aug 2021, 12:17 pm   #11
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Default Re: Electric clock c1900

It has been suggested that this is a Master clock, with the ability to drive slaves, but I'm not so sure.

The face strikes me as form over function, not suited do an industrial clock, quite beautiful in fact with no minute marks

Give the clock-winder his P45 and replace him with a couple of Leclanchés!

Just my thoughts I know nothing about clocks really.
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Old 29th Aug 2021, 2:34 pm   #12
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Default Re: Electric clock c1900

Some photos I have been sent.

John.
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Old 29th Aug 2021, 2:47 pm   #13
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Default Re: Electric clock c1900

And these.

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Old 29th Oct 2021, 11:08 pm   #14
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Default Re: Electric clock c1900

I have seen the clock. The dial is not original, It had an ornate brass face originally. The electromagnet, on the making of the circuit send one of the two weights to the top, the contacts then are open until the other weight reaches the bottom and closes the contact. In the first picture the contacts (inverted L shape to the left of the picture) can be seen, they are about to close as the weight is nearing the bottom of its travel.

Second photo, showing the large copper plated steel plate that is attracted to the electromagnet. Also a better view of the latching used for the weights.

Third picture shows the leather cushion the weights hit, and where the pendulum hangs. The thin brass rod on the right is moved by the pendulum.

Sorry for the misleading information in earlier posts.
John.
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Old 30th Oct 2021, 3:01 am   #15
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Default Re: Electric clock c1900

How often does the winder solenoid have to operate to keep it wound?
There were quite a few spring wound clocks about just before quartz became common that wound several times per hour also using a solenoid.
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Old 30th Oct 2021, 10:15 am   #16
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Default Re: Electric clock c1900

Quote:
Originally Posted by Refugee View Post
How often does the winder solenoid have to operate to keep it wound?
.
In the region of 1 pulse per minute. Will know more when it is up and running correctly.

John.
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Old 30th Oct 2021, 10:28 am   #17
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Default Re: Electric clock c1900

This sounds similar to 2 Gibson Baume & co clocks I have here, they run from 4V, and every 2 minutes or so they go CLUNK and wind themselves up! In those clocks they have a basically normal spring wound movement, with contacts on an arm with 2 weights on it, when the spring winds down, the contacts fire the solenoid which flicks the arm and winds the spring, interesting to watch, and always makes people jump who aren’t expecting it!

Regards
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Old 30th Oct 2021, 11:54 am   #18
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Default Re: Electric clock c1900

A pendulum clock driven by a couple of small weights which sounds more accurate than spring wound as the force is more consistent and it lasts as long as the battery unlike the weights in a longcase.
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Old 30th Oct 2021, 12:26 pm   #19
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Default Re: Electric clock c1900

https://en.m.wikipedia.org/wiki/Remontoire
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Old 30th Oct 2021, 12:49 pm   #20
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Default Re: Electric clock c1900

Here is a photo that shows much more clearly how an impuls clock works.
This one is actually an elapsed time indicator.
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