26 D. VAN NOSTBAND COMPANY'S 



LEVY, C. L. Electric Light Primer. A Simple and 



Comprehensive digest of all the most important facts connected with 

 the running of the dynamo, and electric lights, with precautions for 

 safety. For the use of persons whose duty it is to look after the 

 plant. 8vo, paper $ .50 



UVACHE, AC'H..(fnffenieur Civil De* Mines.) The Man- 

 ufacture of Varnishes, Oil Crushing, Refining and Boiling and Kind- 

 red Industries. Describing the Manufacture and Chemical and Phy- 

 sical Properties of Spirit Varnishes and Oil Varnishes ; Baw Mater- 

 ials ; Besins ; Solvents and Coloring Principles ; Drying Oils ; their 

 Extraction, Properties and Applications, Oil Befining and Boiling ; 

 The Manufacture, Employment and Testing of Various Varnishes 

 Translated from the French, by John Geddes Mclntosh. Greatly 

 extended and adapted to English practice. With numerous 

 original recipes, by the translator. Illustrated with cuts and dia- 

 grams. 8vo, cloth, illustrated net. $5.00 



LIVERMORE, V. P. & JAMES WILLIAMS. How 



to Become a Competent Motorman. Being a Practical Treatise on the 

 Proper Method of Operating a Street Bailway Motor Car : also giving 

 details how to overcome certain defects. 16mo, cloth, illustrates, 132 

 pages $1.00 



LOBBEN, PEDER, M. E. Machinists' and Draftsmen's 



Hand-Book, containing Tables, Bules and Formulas, with numerous 

 examples, explaining the principles of mathematics and mechanics, as 

 applied to the mechanical trades. Intended as a reference book for 

 all interested in Mechanical work. Illustrated with many cuts and 

 diagrams. 8vo, cloth $2.50 



LOCKE, ALFRED G. and CHARLES G. A Practical 



Treatise on the Manufacture of Sulphuric Acid. With 77 Construe, 

 tive Plates drawn to Scale Measurements, and other Illustrations- 

 Royal 8vo, cloth $10.00 



LOCKERT, LOUIS. Petroleum Motor-Cars. 12mo, 



cloth $1.50 



LOCKWOOD, THOS. D. Electricity, Magnetism, and 



Electro-Telegraphy. A Practical Guide for Students, Operators, and 

 Inspectors. 8vo, cloth. Third Edition $2.50 



Electrical Measurement and the Galvanometer ; Its 



Construction and Uses. Second Edition. 32 illustrations. 12mo, 

 cloth $1.50 



LODGE, OLIVER J. Elementary Mechanics, includ- 

 ing Hydrostatics and Pneumatics. Revised Edition. 12mo, 

 cloth $1.50 



Signalling Across Space, Without Wires ; Being 



a description of the work of Hertz and his successors. With numerous 

 diagrams and half tone cuts, and additional remarks concerning the 

 application to Telegraphy and later developments. Third edition. 

 8vo, cloth, illustrated net, $2.00 



