---- 100,000,000 Combination Code. 8vo, *10 00 ---- Engineering Code. 8vo, *12 50 Livermore, V. P., and Williams, J. How to Become a Competent Motorman 12mo, *1 00 Livingstone, R. Design and Construction of Commutators. 8vo, *2 25 ---- Mechanical Design and Construction of Generators. 8vo, *3 50 Lloyd, S. L. Fertilizer Materials. (_In Press._) Lobben, P. Machinists' and Draftsmen's Handbook. 8vo, 2 50 Lockwood, T. D. Electricity, Magnetism, and Electro-telegraph. 8vo, 2 50 ---- Electrical Measurement and the Galvanometer. 12mo, 0 75 Lodge, O. J. Elementary Mechanics. 12mo, 1 50 ---- Signalling Across Space without Wires. 8vo, *2 00 Loewenstein, L. C., and Crissey, C. P. Centrifugal Pumps. *4 50 Lomax, J. W. Cotton Spinning. 12mo, 1 50 Lord, R. T. Decorative and Fancy Fabrics. 8vo, *3 50 Loring, A. E. A Handbook of the Electromagnetic Telegraph. 16mo, 0 50 ---- Handbook. (Science Series No. 39.) 16mo, 0 50 Lovell, D. H. Practical Switchwork. 12mo, *1 00 Low, D. A. Applied Mechanics (Elementary). 16mo, 0 80 Lubschez, B. J. Perspective. 12mo, *1 50 Lucke, C. E. Gas Engine Design. 8vo, *3 00 ---- Power Plants: Design, Efficiency, and Power Costs. 2 vols. (_In Preparation._) Luckiesh, M. Color and Its Application. 8vo, *3 00 ---- Light and Shade and Their Applications. 8vo, *2 50 Lunge, G. Coal-tar and Ammonia. Three Volumes. 8vo, *20 00 ---- Technical Gas Analysis. 8vo, *4 00 ---- Manufacture of Sulphuric Acid and Alkali. Four Volumes. 8vo, Vol. I. Sulphuric Acid. In three parts. 18 00 ---- Vol. I. Supplement. 8vo, 5 00 Vol. II. Salt Cake, Hydrochloric Acid and Leblanc Soda. In two parts. *15 00 Vol. III. Ammonia Soda. *10 00 Vol. IV. Electrolytic Methods. (_In Press._) ---- Technical Chemists' Handbook. 12mo, leather, *3 50 ---- Technical Methods of Chemical Analysis. Trans. by C. A. Keane in collaboration with the corps of specialists. Vol. I. In two parts. 8vo, *15 00 Vol. II. In two parts. 8vo, *18 00 Vol. III. In two parts. 8vo, *18 00 The set (3 vols.) complete. *50 00