verso: text and illustration: The water clock of the drummers from Kitab fi ma'arifat al-hiyal al-handisaya (The book of knowledge of ingenious mechanical devices) Automata by al-Jazari)

ink, opaque watercolor and gold on paper

The Elephant Clock", from a Book of the Knowledge of Ingenious Mechanical Devices by al-Jazar

11 13/16 in.x 7 3/4 in.; ink, opaque watercolor, and gold on paper

The complete cost-keeper: some original systems of shop cost-keeping or factory accounting, together with an exposition of the advantages of account keeping by means of cards instead of books, and a description of various mechanical aids to factory accounting,

Mode of access: Internet.

Safety code for mechanical power-transmission apparatus : rules for guarding prime movers, intermediate equipment, and driven machines : approved by American Standards Association as an American standard, 1927 /

"ASA B15-1927"--Cover.