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 ELECTRICAL HOROLOGY. By H. R. LANGMAN and A. BALL. 180 pages profusely illustrated. A practical manual on the application of the principles and practices of electricity to horological instruments and machines for the measure ment and transmission of time with an account of the earliest electrically-driven clock mechanism. 180 pages. Illustrated. Price $3.00 THE WATCHMAKER'S HANDBOOK. By CLAUDIUS SAUNIER. Translated from the French by Cladius Saunier, and enlarged by Julien Tripplin, F.R.A.S., and Edward Rigg, M.A. A workshop companion for those engaged in watchmaking and the allied mechanical arts. As an encyclopedia for the practical watchmaker and repairer this work stands paramount. The chapter on practical receipts alone is a mine of information. Over 500 pages. New and revised edition. 14 folding plates. Price $5.00 WATCH REPAIRING AND MAKING. By F. J. GARRARD. Practical Watchmaker. Author of "Watch Repairing, Cleaning and Adjusting." Covers the Cleaning and Repairing of Watches. Treats on the materials and tools used. Shows how to alter and adjust all kinds of English and Foreign Watches, Repeaters, Chronographs and Marine Chronometers. 214 pages. Seventh edition. Illustrated by over 200 engravings. Price $3.00 CONCRETE CONCRETE WORKERS' REFERENCE BOOKS. A SERIES OF POPULAR HANDBOOKS FOR CONCRETE USERS. Prepared by A. A. HOUGHTON. The author, in preparing this Series, has not only treated on the usual types of construction, but explains and illustrates molds and systems that are not patented, but which are equal in value and often superior to those restricted by patents. These molds are very easily and cheaply constructed and embody simplicity, rapidity of operation, and the most successful results in the molded concrete. Each of these books is fully illustrated, and the subjects are exhaustively treated in plain English. CONCRETE WALL FORMS. By A. A. HOUGHTON. A new automatic wall clamp is illustrated with working drawings. Other types of wall forms, clamps, separators, etc., are also illustrated and explained. (No. 1 of Series) 75 cents CONCRETE FLOORS AND SIDEWALKS. By A. A. HOUGHTON. The molds for molding squares, hexagonal and many other styles of mosaic floor and sidewalk blocks are fully illustrated and explained. (No. 2 of Series) . . 75 cents PRACTICAL CONCRETE SILO CONSTRUCTION. By A. A. HOUGHTON. Complete working drawings and specifications are given for several styles of concrete silos, with illustrations of molds for monolithic and block silos. The tables, data, and information presented in this book are of the utmost value^in planning and constructing all forms of concrete silos. (No. 3 of Series) 75 cents MOLDING CONCRETE CHIMNEYS, SLATE AND ROOF TILES. By A. A. HOUGHTON. The manufacture of all types of concrete slate and roof tile is fully treated. Valuable data on all forms of reinforced concrete roofs are contained within its pages. The construction of concrete chimneys by block and monolithic systems is fully illustrated and described. A number of ornamental designs of chimney construction with molds are shown in this valuable treatise. (No. 4 of Series.) 75 cents MOLDING AND CURING ORNAMENTAL CONCRETE. By A. A. HOUGHTON. The proper proportions of cement and aggregates for various finishes, also the method of thoroughly mixing and placing in the molds, are fully treated. An exhaustive treatise on this subject that every concrete worker will find of daily use and value (No. 5 of Series.) 75 cents II