Internet Horology Club 185
Seth Thomas D105 movement

This topic can be found at:
https://ihc185.infopop.cc/eve/forums/a/tpc/f/9886029761/m/2283924297

January 31, 2019, 20:08
Ken Snowden
Seth Thomas D105 movement
I recently purchased a Seth Thomas carriage clock on eBay. It has the D105 movement in it. I have not completely torn down the movement, but I am trying to understand what the mechanism in back of the dial and in front plate of the movement is for.


January 31, 2019, 20:09
Ken Snowden
The fan in the rear governs the strike. I am trying to understand what the fan in the front does.


January 31, 2019, 20:13
Ken Snowden
Another view.


February 01, 2019, 08:26
Dave Turner
Ken, I don't have a clue, but I did find reference to another D105 on that "other site". And found that some of the components are gold plated.


Dave Turner
February 01, 2019, 12:39
Ken Snowden
Here is a photo of the clock. It is listed in Tran's Seth Thomas book third edition as Carriage No. 7. There is no evidence that anything is missing from the clock, so whatever the function of the extra train, it is integral to this movement.


February 01, 2019, 12:40
Ken Snowden
Rear view. Height including handle is 9 inches.


February 01, 2019, 13:23
Dave Turner
I've been studying this and coming up short. Can't find anything close to it. Nice clock though!


Dave Turner
February 01, 2019, 13:56
Dave Turner
What is that pin sticking out toward the edge of the movement, just below the fly, and also the arbor down below with the arm extending into the movement?




Dave Turner
February 01, 2019, 15:28
Ken Snowden
That pin is an arm that extends down the front and activates the train to move.
The arbor has a post on it similar to the post that counts the hour on a striking clock. It is hard to see just what it does, and I have not fully disassembled the movement.
February 01, 2019, 19:04
Mike Benda
Very nice clock.
Not an expert, but would the face cutout be for day,date or month?
Happy gear meshing.
Mike
February 01, 2019, 20:11
Eddie G. Hines
COULD THE FAN IN FRONT CONTROL SOME TYPE OF A REWINDER ,REMONTOIRE OR WHAT EVER. THE CUTOUT IN FRONT IS THERE TO EXPOSE THE ESCAPE WHEEL. DOES THE CLOCK RUN?
February 01, 2019, 21:21
Dave Turner
I keep thinking alarm clock, but don't really think it is.


Dave Turner
February 01, 2019, 23:28
Ken Snowden
The clock does run. I think the tension on the minute hand is a bit weak, and it does need a complete service.
February 02, 2019, 12:44
Dave Turner
Ken, Found an old post here on a 103A movement I worked on, that shows a picture during the teardown.
Not exactly the same movement, but internal pictures might help.
https://ihc185.infopop.cc/eve/f...6029761/m/9713967087


Dave Turner
February 02, 2019, 15:13
Ken Snowden
Dave, I have serviced the 103 A movement. This movement is much superior. I will be tearing it down soon, so I will probably provide some pictures and hopefully an explanation for the function of the additional train.
February 09, 2019, 13:19
Ken Snowden
I believe that the additional train is used to wind a small mainspring behind the removeable platform that holds the balance wheel with its gear train.