10 

 ELECTROTYPE MANIPULATION: 



Being the Theory and Plain Instructions in the Art of Working 

 in Metals, by Precipitating them from their Solutions, through 

 the agency of Galvanic or Voltaic Electricity. By Chakles V. 

 Walkek, Hon. Secretary to the London Electrical Society, etc. 

 Illustrated by Wood-cuts. In one volume, 24mo., cloth. From 

 the thirteenth London edition. 62 cts. 



PHOTOGENIC MANIPULATION: 



Containing the Theory and Plain Instructions in the Art of 

 Photography, or the Productions of Pictures through the Agency 

 of Light ; including Calotype, Chrysotype, Cyanotype, Chroma- 

 type, Energiatype, Anthotype, Amphitype, Daguerl-eotjrpe, 

 Thermography, Electrical and Galvanic Impressions. By 

 George Thomas Fisher, Jr., Assistant in the Laboratory of 

 the London Institution. Illustrated by wood-cuts. In one vo- 

 Jume, 24mo., cloth. 62 cts. 



MATHEMATICS FOR PRACTICAL MEN: 



Being a Common-Plj^ce Book of Principles, Theorems, Rules, 

 and Tables, in various departments of Pure and Mixed Mathe- 

 matics, with their Applications ; especially to the pursuits of 

 Surveyors, Architects, Mechanics, and Civil Engineers, with nu- 

 merous Engravings. By Olinthus Gregory, L. L. J). $1.50. 



Only let men aw.ake, and fix their eyes, one while on the nature of things, 

 another while on the application of them to the use and service of mankind. 

 —Lord Bacon. 



AN ELEMENTARY COURSE OP INSTRUCTION 

 ON ORDNANCE AND GUNNERY : 



Prepared for the use of the Midshipmen at the Naval School. 

 By James H. Ward, U. S, N. In one volume, octavo. $1.50. 



