Wireless Telegraphy and Telephony

 CATALOGUE OF GOOD, PRACTICAL BOOKS MARINE ENGINEERING MODERN 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—every- thing is accurate and to scale. It is absolutely correct in every detail, having been approved by naval engineers. All the machinery and devices fitted in a modern | Submarine Boat are shown, and to make the engraving more readily understood I all the features are shown in operative form, with Officers and Men in the act of per- forming the duties assigned to them in service conditions. THIS CHART IS REALLY AN ENCYCLOPEDIA OF A SUBMARINE. It is educational and woi’th many times its cost. Mailed in a tube for............................25 cents PATTERN MAKING PRACTICAL PATTERN MAKING. By F. W. Barrows. This book, now in its second edition, is a comprehensive and entirely practical treatise on the subject of pattern making, illustrating pattern work in both wood and metal, and with definite instructions on the use of plaster of paris in the trade. It gives specific and detailed descriptions of the materials used by pattern makers and de- scribes the tools, both those for the bench and the more interesting machine tools; having complete chapters on the Lathe, the Circular Saw, and the Band Saw. It gives many examples of pattern work, each one fully illustrated and explained with much detail. These examples, in their great variety, offer much that will be found of interest to all pattern makers, and especially to the younger ones, who are seeking information on the more advanced, branches of their trade. In this second edition of the work will bo found much that is new, even to those wlio have long practised this exacting trade. In the description of patterns as adapted to the Moulding Machine many difficulties which have long prevented the rapid and economical production of castings are overcome; and this great, new branch of the trade is given much space. Stripping plate and stool plate work and. the less expen- sive vibrator, or rapping plate work, are all explained in detail. Plain, everyday rules for lessening the cost of patterns, with a complete system of cost keeping, a detailed method of marking, applicable to all branches of the trade, with complete information showing what the pattern is, its specific title, its cost, date of production, material of which it is made, the number of pieces and core- boxes, and its location in the pattern safe, all condensed into a most complete card record, with cross index. The book closes with an original and practical method for the inventory and valua- tion of patterns. Containing nearly 350 pages and 170 illustrations. Price. $2.00 PERFUMERY PERFUMES AND COSMETICS, THEIR PREPARATION AND MANUFACTURE. By G. W. Askinson, Perfumer. A comprehensive treatise, in which there has been nothing omitted that could be of value to the perfumer or manufacturer of toilet preparations. Complete directions for making handkerchief perfumes, smelling-salts, sachets, fumigating pastilles; preparations for the care of the skin, the mouth, the hair, cosmetics, hair dyes and other toilet articles are given, also a detailed description of aromatic substances; their nature, tests of purity, and wholesale manufacture, including a chapter' on synthetic products, with formulas for their use. A book of general, as well as professional in- terest, meeting the wants not only of the druggist and perfume manufacturer, but also of the general public. Among the contents are: 1. The History of Perfumery. 2. About Aromatic Substances in General. 3. Odors from the Vegetable Kingdom. 4. The Aromatic Vegetable Substances Employed in Perfumery. 5. The Animal Sub- stances Used in Perfumery. 6. The Chemical Products Used in Perfumery. 7. The Ex- traction of Odors. 8. The Special Characteristics of Aromatic Substances. 9. TheAdul- tcration of Essential Oils and Their Recognition. 10. Synthetic Products. 11. Table of Physical Properties of Aromatic Chemicals. 12. The Essences or Extracts Employed inj?erfumery. 13. Directions for Making the Most Important Essences and Extracts. 2Ö