Incoming Hamilton model 21 chronometer

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River Rat
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Re: Incoming Hamilton model 21 chronometer

Post by River Rat » Sun Jul 29, 2018 12:53 pm

Well the chronometer is done getting serviced. Should get it back next week. Only one part needed detent trip spring is worn down so needed replaced. Keeps good time +0.5 seconds in 2 days. I read these were kept running 24/7 aboard ship they were so good they only lost a minute a year. In the US Navy if the quartermaster whose responsibility is to wind it every day failed to he could be court-martialed even though they run 48-56 hours shows how important these were. Our Navy in WW2 mite of had another out come with out these you had to know how to navigate the ship to the right location in WAR to be on time and on station. A Battle Ship or Carrier had three on board in different location so if one got damage due to combat there was all ways a spare. In the book military timepieces the author of the book worked at the Naval observatory that did maintenance on these. His brother was on the USS Abner Read DD 526 he lost a brother on that ship during the battle of Attu well they got a chronometer from that ship to service each chronometer has a log with it and he found out how his brother died it struck a mine and lost the fantail the fantail is the back end of the ship so a quarter of the ship got blown off also the end were the prop is he had to get permission from the Navy to pass the info to his parents how his Brother died. The USS Abner Read DD 526 lived to fight another day it was towed to Puget Sound Navy Yard refitted and repaired. A lot of history with these Chronometers. In that log it would tell any incident that mite change the time in the chronometer like if they did shore bombardment how many rounds were shot if a kamikaze hit the ship and like when that ship hit a mine must of been hard to read about what happened to his brother. The USS Abner Read DD 526 was later sunk by a Kamikaze.
https://en.wikipedia.org/wiki/USS_Abner_Read_(DD-526)

River Rat
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Re: Incoming Hamilton model 21 chronometer

Post by River Rat » Sat Aug 04, 2018 4:33 am

Well did a little work on the outer box.
Image
Before
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After. Cleaned up the box a little and I replaced the missing carrying leather strap and used a extra issued number plaque I found in the bottom of the inner box.
Image
Picked up the movement at the post office in the morning the other day had to wait until the afternoon to check it out and put her back in the gimble box. Had to take my brother to the VA emergency at Fort Harrison a 100 mile drive one way so messing with this chronometer had to wait wish the VA would help him all ways seems like they just put a band aid on health problems these days. Well she runs great. Before the service this movement had some problems. Like when you wound it you did not hear the clicks and if you wound it when it was running the second hand would go backwards a little and the movement would stop and the brass tub the key hole were you put the key in to wind it has a spring loaded cover you move to put the key in and it covers the hole when not in use to protect the movement from dust did not work good. Well all those problems are now taken care of. She runs great now. Probably been 40 years since this sucker been serviced.

ncstate1201
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Re: Incoming Hamilton model 21 chronometer

Post by ncstate1201 » Sat Aug 04, 2018 5:24 am

Looking good, hard to find one with inner box intact let alone with the outer and now a leather strap and number plaque

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Grahamcombat
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Re: Incoming Hamilton model 21 chronometer

Post by Grahamcombat » Sat Aug 04, 2018 7:41 am

That’s really cool Mike.

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gonzomantis
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Re: Incoming Hamilton model 21 chronometer

Post by gonzomantis » Sat Aug 04, 2018 8:06 am

Outstanding! Makes me want to start looking, as if I need another place to spend money.

River Rat
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Re: Incoming Hamilton model 21 chronometer

Post by River Rat » Sat Aug 04, 2018 9:15 am

Now for any one thinking of getting one. These are delicate Navigation instruments. Don't trust most Ebay seller who sell them just make sure there in running condition and they know how to cork the balance wheel for shipping and the brass case with movement in it's own cardboard box and the wooden boxes in another mine the movement in the brass tub was in it's own box and the wooden box the main box so both were in the main box and well padded if the brass tub left in the wooden gimble box damage to the wooden box can happen in shipping so ask the seller a lot of questions . Before you use it for long periods have it serviced here is who I used he had the best price out of two I would trust working on these he was half the price.
http://jlcrabtree.com/clox.html
Never move the hands backwards can damage the movement all ways forward, you will notice when you wind it when at a complete stop it will not start you wait for the correct second on the GOVT. time web site and give it a gental twist at the right second and she running then set the hour and minute hands with the winding key in the center of the hands a nut the key fits there and turn for the proper time. They say keep these running 24/7 so wind it every day or it could change the timing. Or if you let it sit for a while cork the balance wheel with a small piece of paper or a real piece of cork cut really small a slever and let it run down for a complete stop before you do it protects the balance wheel and detent. Just some pointers. These were sold to the Navy for 680.00 apiece in WW2 with inflation that would be about 10 grand a lot of money back in WW2. I did not pay that the military all ways over pays for stuff even back then.

River Rat
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Re: Incoming Hamilton model 21 chronometer

Post by River Rat » Sat Aug 04, 2018 9:54 am

You know when you open the outer and inner box to this chronometer you all most smell the sea. There's a musty smell I will never forget like this deck equipment locker on my first ship that was 3-4 decks down you used block and tackle to pull stuff out only way in was a scuttle hatch strait down and a ladder. Some A-hole put FTN on a locker in our deck department berthing space so the boatswain took away all deck department liberty that day after working hours had us remove every thing from the deck equipment locker and put it on main deck as punishment 3-4 decks worth of shit. Anchor chain links turnbuckles pelican hooks for the anchor chain heavy shit with a block and tackle and all kinds of stuff this was in Guam no air-conditioning then clean it and put every thing back we looked like wet rats and black from dirt when done. I would of kicked that guys ass who put FTN on a locker if I knew who he was. It did work no one ever put FTN on a locker after that.
Last edited by River Rat on Sat Aug 04, 2018 1:29 pm, edited 1 time in total.

River Rat
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Re: Incoming Hamilton model 21 chronometer

Post by River Rat » Sat Aug 04, 2018 10:55 am

Here is one for sale on our favorite auction site ya right.
https://www.ebay.com/itm/Marine-Chronom ... 0.XHa.TRS1
Some one cleaned it up. What different on this it has a devise you use a allen wrench to tighten it down and loosen it on the movement to secure the balance wheel instead of corking it. The Navy did this when they got serviced at the Naval observatory and put these on. His price a little high I would say it will need a 400 dollar service make a offer of 2000 due to the service it will need. And see if he takes it if you want one for the collection.

River Rat
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Re: Incoming Hamilton model 21 chronometer

Post by River Rat » Mon Aug 06, 2018 8:24 am

I set the time last Friday to the GOVT. time site. So far +3s in four days I will do another time check on this Friday for a 7 day run time. Not bad for a 73 year old timepiece.

River Rat
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Re: Incoming Hamilton model 21 chronometer

Post by River Rat » Sun Aug 19, 2018 8:03 am

When I told the story of the USS Abner Read DD 526 well here is the ending story weird how I was thinking about this and now this.
http://www.spokesman.com/stories/2018/a ... a-found-o/
https://www.msn.com/en-us/news/photos/r ... hp#image=1

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