Toronto and Buffalo: University of Toronto Press 1978. First Edition. xvii, [1 blank], -442 pages. Publisher's blue boards. Overall wear to the yellow pictorial price clipped dust jacket. Bumped corners. Binding bowed. Sound and clean internally, a great working copy. Bookseller tag on front pastedown. Very Good / Very Good. Boards. 
An "extraordinary volume" reference that "traces the complete history of geared planetary machines from the inventions of Archimedes to the astronomical clocks of the present day..." It also studies the craftsmen of the time.
Essential reference for the scientific instrument historian or collector of these fabulous objects.