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Alan, I’ve got a 3/4 master with an F style movement that my dad got many years ago from Western Union. The winding mechanism started to work sporadically so I tried adjusting the coils to facilitate the winding movement. The arm now pulls up but won’t release. Do you know the spec on the clearance for the two coils or am I doing something else wrong? Thank you! Pat Kelly

Wow! An amazing feat of engineering and succinctly explained in < 15 minutes!

Very interesting Videos! Do you know about the clock System, made/used by the german company "Telefonbau und Normalzeit"? It might be interesting for you, although it's for sure much simpler.

Thank you for this video, Mr. Bloore. What I don't understand is why a waiting train is needed. If the hands on the dials are correctly set and receive an impulse at the same time, why would they ever show different times?

Hi your collection is awesome clocks my collection is all key wound clocks and a few electric you have changed my way on thinking on electro mechanicl clocks thank you for your video

My first problem has been finding a DC power supply that runs on batteries. My searches have only found AC power supplies or AC conversions for battery powered units.

Thank you very much for the video that shows how does the subsidiary clock synchronized with master clock.

Amazing videos. I too am a former IBMer and history buff. I just purchased a 1919 international (IBM) school clock. Could you, would you assist me in how to get this clock running? I was in sales, and not nearly as technical as you. Much appreciated!!!

Thank you very much for your explanation!

I worked with these clocks in England on the London Underground (Subway), they bought over 400 hundred in the early 1900s and still had over 300 well into the 1980s. The lowest serial number I saw was 47283, the clocks were delivered from 1905-1907. Highest I saw in the first batch was 51532. They bought some more around 1923, I have 178361 which would have been from that batch. Last ones they bought were 1927 and the highest I have seen from that era is 195972. Over half of the Underground's SWCC clocks were 24" dial double faced versions in spun copper cases

Interesting, thanks for sharing.

I recently got an Ogden.

great video, nice to see my Bulle's.

Thanks Alan. I bought an ITR Master off Les with the dual jar mercurial pendulum. It keeps excellent time. I had no idea how their correction systems worked. You made it very easy to understand. Your collection is awesome.

Interested in the half minute impulse slave clock as I have a Western Union master clock with two different cams on the modified second hand one is 30 or 1mn sec points that do not lift off the other cam is 1hr contact that lifts ?

Hi, great video! I have a mostly complete clock like this one. I'm working on getting it going again but am looking for parts. It looks like I need the motor assembly, mainspring assembly (the complete assemblies that mount on the mechanical movement) and the hands. Do you have any spare parts available or know where I may be able to find them? Thanks for any help or information!

Have I understood it correctly that the minutes hand of the subsidiary clock is reset every hour at the pulse of the master clock? But how about the hour hand? Suppose every hour the subsidiary clock is 1 minute faster then the master clock. Then every hour the minute hand is set back one minute. But after 60 hours, it is been set back a full hour, at which point the hour hand, if not adjusted, is one hour too fast. So I suppose that the hour hand also has a slip fitting and that both the hour and minute hand stay connected witha 12:1 gear ratio. Is that so?

Alan! Another fantastic informational video. Thank you!

Another great video showing a great collection and description of how they work, to be shared with future generations! Thanks!

Wow, what a great collection! Electro-mechanical clocks are my favorite too... I had a large collection of traditional clocks, but winding their springs became a chore that was hard on my wrist. Now I've sold off most everything not weight driven or electro-mechanical. I've got an ITR/IBM system with 17-7 master, a Gents Pul-Syn-Etic, and a few from Self Winding Clock Co.

Thank you! As always I learn more from your videos about the history and mechanics of timekeeping devices.

thank you for posting. i love your collection, and you make great videos explaining these engineering marvels.

Have the clock. Pendulum moves and clicks but as it swings finally comes to a stop. Put your two d cells. Started pendulum still slows to stop. Can here the self wind if I touch the frame but when hook to + area clock will not continue. Any ideas? Thank you.

Very interesting, Alan. Do you have any idea how many were made?

Looks like fun, I only ride mine around Sierra Madre

Wonderful video as usual Mr Bloore. How can I get in touch with you ? I have several questions about master clocks in general but I have come across a clock and can not find another example. I was hoping you might be able to help.

do you repair? i hear and extra whisp in the movement on on eo f ours. one hsaft seems to be loose,

Amazing! Is your collection ever visible to the public? Thanks

Thanks so much! I have a SET master from 1924 that I restored with the bell tape and mercury pendulum. I really enjoyed the video on the IBM 3-wire system, as trying to keep a secondary clock sync'd to the SET master has been less than satisfying. Greatly enjoyed your videos!

My dad Has a master clock he kept from a Lodi California office when he worked for Western Union. Movement number is 59437. Can you tell me anything about this number. He wants me to sell it and give the money to my son. Can you tell me anything about its worth?

I have a vintage Verichron branded wall clock with balance wheel and spring. More than once an hour, a small electric motor powered by a D cell battery winds the spring. I don't know if it was manufactured before or after the Self Winding Clock Company went out of business. Clearly, it was sold as an inexpensive consumer wall clock. Modern quartz wall clocks run on a smaller battery and can be expected to keep much better time. They have an electric motor which drives the hands through a gear chain. Most move the second hand in steps once a second, but there are quartz clocks which move the second hand with a smoother motion.

slave clock:{\displaystyle Q_{\text{next}}=J{\overline {Q}} {\overline {K}}Q}

*promosm* 😒

Your videos are always very interesting. I have been fascinated with time synchronization since a child. I would watch our old Standard Electric clocks in elementary school and wonder how it worked.

Great tour of some of my favorite places to ride!

beautiful papa! how cool

Camaraderie and other wonderful memories

Awesome!!

Thank you for sharing. What great views!

Do you have any Self Winding Clock Company clocks for sale? I also see a print on your wall from the 1893 Exposition! Nice!

Our school slave clocks only got impulses every 2 mins . Is that a feature ?

At the elementary school that I went to in the 60's, they used Stromberg-Carlson clocks with the sync feature. I remember them at 59 minutes would pulse several times, even if they were correct, but would not advance until the 60th (0 time) minute. I also remember when they were slow, they would step up to the 59th minute where the minute hand would "lock" but still pulse. They were pulse driven though and would receive a step pulse every minute that lasted about 5 seconds. I knew the master was in the front office, but really didn't know how the system worked. Thank you for the detailed explanation!

Another wonderful video from the world’s #1 expert! Thank you Alan! Great education preserved and shared!

i have no clue why i am only finding your channel now. your collection is magnificent, thank you for sharing your knowledge and your collection. i wish one day i could find a SWCC master, thank you for posting these videos so that the history of these clocks is preserved.

Always appreciate your detailed and knowledgeable descriptions. You're a big help to all amateur electric horologists.

Thanks for another interesting video. Liked and Subscribed. Is there a way one can contact you with questions about a specific clock?

Thanks for another great and informative video! Seeing a new video from you pop up today was a great way to start a day

Great to see another one of your fascinating videos. Your videos did indeed get me into collecting master clocks. I should do a video of my National Time Recorder Master Clock and two NTR programmable slaves one day.

Do you happen to know much about the system that replaced this? I've found one news article that leads me to believe an IBM Type 37 was used as a replacement master.

I've found your videos very interesting. Would like to contact you related to dating a SET clock with an earlier movement but can't find contact info. Please send to my email (same name at gmail) if are willing to help. thanks