'"Intensity Coils.' By 'Dyer.' London : Perken Son and Payment, 99, Hatton Garden. 1s. This is one of those valuable little popular manuals which convey a sound elementary knowledge of an important subject in a concise manner. It describes the principal batteries, deals fully with making coils, and illustrates their use by numerous experiments. There are in addition brief explanations of the electric light, the telegraph, telephone, phonegraph, etc."
"'Intensity Coils.' This is the title of one of the publications of Messrs. Perken, Son and Rayment, of Hatton Garden. It is a " beginner's guide to electricity," describing the way to make batteries, bells, coils, electric light, telegraphs, phonographs, telephones, etc. It is already passing through its sixteenth edition, or the 123th thousand. One of the merits of this brochure is that it does not require an expect to understand it."
"Messrs Perken, Son and Rayment, the sixteenth edition of 'Intensity Coils, being a beginner's guide to electricity, describing the way to make batteries, bells, coils, electric light, telegraphs, phonographs, and so on."
"'Intensity Coils.' Perken, Son and Rayment, 99, Hatton Garden, E.C. This forms one of the firm's well-known publications, and is a sort of beginner's guide to electricity, describing the way to make batteries, coils, lights, bells, telegraphs, telephones, phonographs, etc."
"The induction coil has now come into such general favour, and is used for such varied purposes as a medical instrument, a means of scientific research, and an amusing toy for winter's evenings, that several treatises have lately appeared, describing the best methods of its manufacture and management. The object of the little work before us is explained in the following manner in the preface :-
"What is an intensity coil ? How does it differ from other coils? How is it made? What will it do ? These and similar questions are being continually asked, and to furnish intelligible replies to them the following pages have been written It is not a scientific that is here offered to the public, but simply the necessary instructions that those Who want to make or use intensity coils desne to obtain."
"'Intensity Coils.' By 'Dyer' (Perken, Son and Rayment). When a handbook, as for instance the one now demanding attention, retains its position for nearly a quarter of a century, few will be Inclined to dispute the contention that it is a work possessing considerably more backbone than the generality of such publications. The present book was first published in the year 1867, and it is now in is l6th edition. In is pages will be found, given In an eminently readable form, much that will serve to instruct the young idea concerning the electric light, the telephone, the microphone, and other wonders which, more or less, are associated with the great American inventor, Edison. With all the confidence we displayed when twenty years ago we noticed the first edition, we can heartily commend this handbook to the notice of our readers as a publication which will be of mi vice to all persons ' engaged in the interesting experiments about which ' Dyer' has so much to say."
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