Watch and clock escapements :  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. / 
compiled from the well-known escapement serials published in the Keystone. Nearly two hundred original illustrations. 
 - [1st edition]. 
 - 179, [13] pages :  illustrations ;  24 cm 
<br/><br/> Advertisements on last 13 unnumbered pages. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Clocks and watches--Escapements.<br/>Clocks and watches--Escapements.
<br/><br/><label>Subjects--Index Terms: </label>Escapment Science USA Chronometer lever cylinder drawing geometry escapement Textbook oscillator escapement anchor/lever detached/free watch theory technical practical Anonymous Pocket Watch