Frodsham, Charles, <br/><br/>
Isochronism of balance-springs / 
Charles Frodsham. 
 - 31 pages :  illustrations ;  21 cm 
 - Waltham Watch papers ;  v.1 .
 - Waltham Watch papers ;  v.1. .
<br/><br/> Reprint of: Waltham, Mass., 1862. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Clocks and watches.<br/>Springs (Mechanism)
<br/><br/><label>Subjects--Index Terms: </label>OscillationScience Not Geographic isichronism watch balancewheel advanced Fordsham Charles Pocket Watch