SCIENCE SERIES. 



No. 81. WATER METERS : COMPARATIVE TESTS OP 

 ACCURACY, DELIVERY, ETC. Distinctive features of the Worth- 

 ington, Kennedy, Siemens, and Hesse meters. By Ross E. Browne. 



No. 82. THE PRESERVATION OF TIMBER BY THE USE 

 OF ANTISEPTICS. By Samuel Bagster Boulton, C.E. 



No. 83. MECHANICAL INTEGRATORS. By Prof. Henry S. H. 

 Shaw, C.I-:. 



No. 84. FLOW OF WATER IN OPEN CHANNELS, PIPES, 

 CONDUITS, SEWERS, ETC. With Tables. By P. J. Flynn, C.E. 



No. 85. THE LUMINIFEROUS AETHER. By Prof, de Volson Wood. 



No. 86. HAND-BOOK OF MINERALOGY; DETERMINATION 

 AND DESCRIPTION OF MINERALS FOUND IN THE UNITED 

 STATES. By Prof. J. C. Foye. 



No. 87. TREATISE ON THE THEORY OF THE CON- 

 STRUCTION OF HELICOIDAL OBLIQUE ARCHES. By John 

 L. Culley, C.E. 



No. 88. BEAMS AND GIRDERS. Practical Formulas for their Re- 

 sistance. By P. H. Philbrick. 



No. 89. MODERN GUN-COTTON : ITS MANUFACTURE, 

 PROPERTIES, AND ANALYSIS. By Lieut. John P. Wisser, U.S.A. 



No. 90. ROTARY MOTION, AS APPLIED TO THE GYRO- 

 SCOPE. By Gen. J. G. Barnard. 



No. 91. LEVELING: BAROMETRIC, TRIGONOMETRIC, AND 

 SPIRIT. By Prof. I. O. Baker. 



No. 92. PETROLEUM : ITS PRODUCTION AND USE. By 

 Boverton Redwood, F.I.C., F.C.S. 



No. 93. RECENT PRACTICE IN THE SANITARY DRAIN- 

 AGE OF BUILDINGS. With Memoranda on the Cost of Plumbing 

 Work. Second edition, revised. By William Paul Gerhard, C. E. 



No. 94. THE TREATMENT OF SEWAGE. By Dr. C. Meymott 



Tidy. 



No. 95. PLATE GIRDER CONSTRUCTION. By Isami Hiroi, C.E. 

 Second edition, revised and enlarged. Plates and Illustrations. 



No. 96. ALTERNATE CURRENT MACHINERY. By Gisbeit 

 Kapp, Assoc. M. Inst., C.E. 



No. 97. THE DISPOSAL OF HOUSEHOLD WASTE. By W. 

 Paul Gerhard, Sanitary Engineer. 



No. 08. PRACTICAL DYNAMO-BUILDING FOR AMATEURS. 

 HOW TO WIND FOR ANY OUTPUT. By Frederick Walker. 

 Fully illustrated. 



Wo. 99 TRIPLE-EXPANSION ENGINES AND ENGINE 

 TRIALS. By Prof. Osborne Reynolds. Edited, with notes, etc., by 

 F. E. Idell. M. E. 



