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Restoring an Anniversary Clock by Phillipp Haas C1902

One good reason ( if you need one!) for repairing this clock was the fact it came with an unusual pendulum. it's a temperature compensating pendulum (attributed to P Hauck) which has a fused bi-metal split ring that expanded and contracted with temperature changes, this was in an effort to improve the timekeeping of these clocks. Paul Hauck must have sold these pendulums to several clock manufactures as I have seen them on various early clocks over the years.

picture of the pendulum before cleaning

This is a picture of the pendulum before cleaning and repair, covered in old metal polish!!

Side view with weight removed

Side view with weight removed showing years of old brass polish trapped under the weight, these clocks came lacquered  and should never be cleaned  in this way.

There was even metal polish in the pivot holes!!

There was even metal polish in the pivot holes!!

And here too you can see more polish!!

The movement was found to be completely sized- up and great care was needed to take the plates apart without breaking any of the pivots off. The movement was left in a weak solution of clock cleaner over night, this done the job without removing the original finish to the plates. The rusty pinions were polished by hand and came up well. Next in line for some attention were the pivots, these too came up well after using the pivot file and showed no sign of pitting. I have never had to bush this type of clock, the wheels turn so slowly that wear is virtually nil and they should only need pegging out to put the shine back in the pivot holes. 

The main spring was removed from the barrel using a spring winder -- you should always use one when removing springs from barrels, especially these clocks as the springs are very powerful and will cause
serious injury if it should slip!! 

The newly cleaned and oiled spring fitted in the barrel ready to fit the arbour and cap

The old spring as first seen, coated in old black grease with the coils stuck together-ugh!!

This part of the clock was heavily coated in old polish!

The same part after cleaning 

The pendulum dismantled ready for cleaning 

The pendulum after cleaning--- all signs of polish removed, without loosing the original finish 

Every part of the clock is dismantled for cleaning

picture of front showing motion work and just above the hour wheel the eccentric nut. 

The finished clock

The finished clock, now truly collectable!! 

This clock was a joy to work on- no one had "got at it" and the eccentric nuts ( this clock has two, one at the back for the pallets and one at the front for the escape wheel) were untouched. There should be no  reason to adjust these- they are factory set- and should be left alone! The same goes for the pallets.

The next job was to select a suspension spring of the correct thickness, on older clocks( pre 1949)  like this I start with a spring of say .004" (.102mm) and try that. Firstly adjust the pendulum to it's slowest position and fit the spring for testing, you should find the clock will gain about one hour or so a day, this is good! because you can then thin the spring ( a little at a time) until the clock starts to loose, then adjust the pendulum for correct time keeping. There will be pictures on the techniques used to thin these springs later.

Another important point to note on these suspension springs is where to put the fork in relation to the top block, to high and it'll cause a lumpy motion to the escapement and stop the clock, to low and it will cause the anchor to flutter and time will fly!!  

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