THE "WESTMINSTER'' SERIES 
and wind power which supply mechanical energy without any inter- 
mediate stage of transformation. Most people will be surprised at 
the extent to which these natural power producers are used. The 
widespread application of water power is generally known, but it is 
interesting to learn that the demand for windmills was never so great 
as it is to-day, and there are signs of abnormal expansion in the direc- 
tion of their useful application in the great agricultural countries of 
the world. Though primarily of importance to the engineer, this work 
will be of great interest to every manufacturer who in economizing 
his means of power production can take the natural forces that lie 
to his hand and harness them in his service. The author is the son 
of Sir Robert Ball, the eminent mathematician and astronomer. 
Liquid and Gaseous Fuels^ and the Part they play- 
in Modern Power Production. By Professor 
Vivian B. Lewes, F.I.C, F.C.S., Prof, of Chemistry, 
Royal Naval College, Greenwich. With 54 Illustrations. 
List of Contents : Lavoisier's Discovery of the Nature of Com- 
bustion, etc. The Cycle of Animal and Vegetable Life. Method 
of determining Calorific Value. The Discovery of Petroleum 
in America. Oil Lamps, etc. The History of Coal Gas. Calorific 
Value of Coal Gas and its Constituents. The History of Water 
Gas. Incomplete Combustion. Comparison of the Thermal 
Values of our Fuels, etc. Appendix. Bibliography. Index. 
The subject of this book has, during the last decade, assumed such 
importance that it is hoped this account of the history and develop- 
ment of the use of various forms of combustible liquids and gases 
for the generation of energy may do some service in its advancement. 
Electric Power and Traction. By F. H. Davies, 
A.M.I.E.E. With 66 Illustrations. 
List of Contents : Introduction. The Generation and Distri- 
bution of Power. The Electric Motor. The Application of 
Electric Power. Electric Power in Collieries. Electric Power 
in Engineering Workshops. Electric Power in Textile Factories. 
Electric Power in the Printing Trade. Electric Power at Sea. 
Electric Power on Canals. Electric Traction. The Overhead 
System and Track Work. The Conduit System. The Surface 
Contact System. Car Building and Equipment. Electric Rail- 
ways. Glossary. Index. 
The majority of the allied trades that cluster round the business of 
electrical engineering are connected in some way or other with its power 
and traction branches. To members of such trades and callings, to 
Whom some knowledge of applied electrical engineering is desirable 
if not strictly essential, the book is particularly intended to appeal. 
It deals almost entirely with practical matters, and enters to some 
extent into those commercial considerations which in the long run 
must overrule all others. 
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