Published by The Keystone, Philadelphia PA, 1904
Seller: Chequamegon Books, Washburn, WI, U.S.A.
Hardcover. Condition: Good. 179 pages; 5 7/8 x 9" "A complete study in theory and practice of the lever, cylinder and chronometer escapements, together with a brief account of the origin and evolution of the escapement in Horology." Nearly two-hundred original illustrations. Dark blue cloth boards with gilt lettering and decor on spine. Board and spine edges and corners are worn; 3/4 x 1" area of faded speckles on front board; board panels are lightly worn; light wear to page edges; minor smudges to endpapers.