This fine piece was in quite reasonable mechanical condition even before I got to removing the piles of rancid organic matter off the wheels, pinions, shafts and main plates.

Mechanically it was sound, especially when one considers it's 18th century vintage. What is pictured below is the outer case. There is a smooth case, shown below, that fits the movement more closely and within this outer casing.  The image shown here is of the back of the outer cast case.  What a tremendously bold design.

intricate cast outter watch case

Organic oils, long since done contributing anything useful here.  Rancid and corrosive residue is all that remains of them.

 

tarnished main plate in an 18th century fuse watch

The fusee chain is visible on the cone that it winds up and down on.  The fusee design was an attempt to flatten the power curve out.

When the watch was wound up, the chain would be pulling at the small part of the cone with a poor mechanical

advantage.  As the power wound down, the chain would pull on the cone farther away from it's centre and giving it a much

better mechanical advantage.  This method became redundant when spring technology advanced.

 

fuse chain visible

 

So much more like a clock than the watches we might think of today.  This was a lot of fun to work on as so much of it was either

hand made of hand finished.  Brilliant skills of the finishers on display here.  

 

18th century fuse watch movement