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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