A B C of television; or, Seeing by radio; a complete and comprehensive treatise dealing with the theory, construction and operation of telephotographic and television transmitters and receivers; written especially for home experimenters, radio fans and students.. (1929)

CATALOGUE OF GOOD, PRACTICAL BOOKS GONDOLA CAR CHART. A chart showing the anatomy of a gondola'car, having every part of the car numbered and its proper reference name given in a reference list 35 cents PASSENGER CAR CHART. A chart showing the anatomy of a passenger-car, having every part of the car numbered and its proper name given in a reference list 35 cents STEEL HOPPER BOTTOM COAL CAR. A chart showing the anatomy of a steel Hopper Bottom Coal Car, having every part of the car numbered and its proper name given in a reference list 35 cents TRACTIVE POWER CHART. A chart whereby you can find the tractive power or drawbar pull of any locomotive without making a figure. Shows what cylinders are equal, how driving wheels and steam pressure affect the power. What sized engine you need to exert a given drawbar pull or anything you desire in this lino 50 cents HORSE-POWER CHART Shows the horse-power of any stationary engine without calculation. No matter what the cylinder diameter of stroke, the steam pressure of cut-off, the revolutions, or whether condensing or non-condensing, it's all there. Easy to use, accurate, and saves time and calculations. Especially useful to engineers and designers. 50 cents SUBMARINE CHART. A cross-section view, showing clearly and distinctly all the interior of a Submarine of the latest type. You get more information from this chart, about the construction and operation of a Submarine, than in any other way. No details omitted—everything is accurate and to scale. All the machinery and devices fitted in a Submarine Boat are shown 35 cents CHEMISTRY HOW TO MAKE AND USE A SMALL CHEMICAL LABORATORY. By RAYMOND FRANCIS YATES. The treatise covers all of the essentials of elementary chemistry. The law of definite proportions, solutions, crystalloids, colloids, electrolysis, etc., are explained. The second part of the book is devoted to chemical and electro-chemical experiments. Only those experiments that will tend to broaden the reader's knowledge of chemistry in general have been chosen. Price ,75 cents CLOCK AND WATCHMAKING CLOCKMAKING: PAST AND PRESENT. By C. F. C. GOBDON. With which is incorporated the more important portion of "Clocks, Watches, and Bells," by the late Lord Grimthorpe, relating to Turret Clocks and Gravity Escape ments. By G. F. C. Gordon, M.A., A.M.I.C.E., Superintendent of Workshops cl the Engineering Department of Cambridge University. A practical book of special interest to the Clockmaker, Repairer, Dealer and Collector, in which the author endeavors to cover topics which either have not been covered before, or which from his own experience require more attention than they have hitherto received. 240 pages. Fully illustrated by Diagrams and plates of Long Case, Bracket and other Clocks, Dials, Hands, etc. Price $5.00 CLOCK REPAIRING AND MAKING. By F. J. GARRARD. Practical Watchmaker. Author of "Watch Repairing, Cleaning and Adjusting." A practical handbook dealing with Tools, Materials, and Methods used in cleaning and repairing all kinds of English and Foreign Timepieces, Striking and Chimney Clocks, and the making of English Clocks. 168 pages. Fourth edition. Illustrated by 120 engravings. Price $3.00 10