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Clock Jack

A flickr set of photos showing the workings of 3 clockjacks I have encountered.
http://www.flickr.com/photos/solvarr/sets/72157620082426510/

    Items to elaborate on
  • friction wear takeup screws
  • conical bushings
  • wear takeup plates
  • fly wheel
  • friction based ratchet
Note: Special thanks to Peter Ross for his kind help.

The opera di Bartolomeo
http://www.flickr.com/photos/bibliodyssey/3353004187/sizes/o/

A 1703 Reference

Mechanick exercises:Joseph Moxon

Start looking at page 39 of the book (page 50 of the google book)

or, The doctrine of handy-works. Applied to the arts of smithing, joinery, carpentry, turning, bricklayery. To which is added, Mechanick dyalling: shewing how to draw a true sun-dyal on any given plane, however scituated; only with the help of a straight ruler and a pair of compasses, and without any arithmetical calculation (Google eBook)

http://books.google.com/ebooks?id=t_IRCzjTf08C

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