Langman, Henry R, <br/><br/>
Electrical horology;  a practical manual on the application of the principles and practice of electricity to horological instruments and machines for the measurement and transmission of time, with an account of the earliest electrical-driven clock mechanism, 
by H.R. Langman ... and A. Ball. 
 - 3rd edition., revised and enlarged. 
 - xii, 200 pages  illustrations, diagrams  19 cm 
 - Technical press manuals .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Clocks and watches, Electric.<br/>Clocks and watches, Electric.
<br/><br/><label>Subjects--Index Terms: </label>Clock (general) United Kingdom Bain Hipp Campiche Murday Magneta Shepard Richie Hope-JONES Electric TheoryGeneral