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
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)
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)