THE "WESTMINSTER" SERIES 
chemical or electrical science may be but slight. It is a thoroughly 
practical work descriptive of apparatus and processes, and commends 
itself to all practical men engaged in metallurgical operations, as well 
as to business men, financiers, and investors. 
Radio-Telegraphy. By C. C. F. Monckton, M.I.E.E. 
With 173 Diagrams and Illustrations. 
Contents : Preface. Electric Phenomena. Electric Vibrations. 
Electro-Magnetic Waves. Modified Hertz Waves used in Radio- 
Telegraphy. Apparatus used for Charging the Oscillator. The 
Electric Oscillator : Methods of Arrangement, Practical Details. 
The Receiver : Methods of Arrangement, The Detecting Ap- 
paratus, and other details. Measurements in Radio-Telegraphy. 
The Experimental Station at Elmers End : Lodge-Muirhead 
System. Radio - Telegraph Station at Nauen : Telefunken 
System. Station at Lyngby : Poulsen System. The Lodge- 
Muirhead System, the Marconi System, Telefunken System, and 
Poulsen System. Portable Stations. Radio-Telephony. Ap- 
pendices : The Morse Alphabet. Electrical Units used in this 
Book. International Control of Radio-Telegraphy, Index. 
The startling discovery twelve years ago of what is popularly known 
as Wireless Telegraphy has received many no less startling additions 
since then. The official name now given to this branch of electrical 
practice is Radio-Telegraphy. The subject has now reached a thor- 
oughly practicable stage, and this book presents it in clear, concise 
form. The various services for which Radio-Telegraphy is or may 
be used are indicated by the author. Every stage of the subject is 
illustrated by diagrams or photographs of apparatus, so that, while 
an elementary knowledge of electricity is presupposed, the bearings 
of the subject can be grasped by every reader. No subject is fraught 
with so many possibilities of development for the future relationships 
of the peoples of the world. 
India-Rubber and its Manufacture, with Chapters 
on Gutta-Percha and Balata. By H. L. Terry, 
F.I.C., Assoc.Inst.M.M. With Illustrations. 
List of Contents : Preface. Introduction : Historical and 
General. Raw Rubber. Botanical Origin. Tapping the Trees. 
Coagulation. Principal Raw Rubbers of Commerce. Pseudo- 
Rubbers. Congo Rubber. General Considerations. Chemical 
and Physical Properties. Vulcanization. India-rubber Planta- 
tions. India-rubber Substitutes. Reclaimed Rubber. Washing 
and Drying of Raw Rubber. Compounding of Rubber. Rubber 
Solvents and their Recovery. Rubber Solution. Fine Cut Sheet 
and Articles made therefrom. Elastic Thread. Mechanical 
Rubber Goods. Sundry Rubber Articles. India-rubber Proofed 
Textures. Tyres. India-rubber Boots and Shoes. Rubber for 
Insulated Wires. Vulcanite Contracts for India-rubber Goods. 
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