OLIDHED THUMB TACKS IN COLORS ARE THE HANDIEST AND MOST ATTRACTIVE FASTENING For Drawings, Show Cards, Photos, Window Dressing, etc. Sample doz, postpaid, colors, 20c., brass, 106. HAWKES-JACKSON COMPANY, Makers, 82 Duane Street, NEW YORK. PATENTS Send for Booklet. Valuable and Saiable Patents Promptly Secured. SHEPHERD & PARKER, Patent Lawyers "During the past ten years Mr. Shepherd, of Shepherd & Parker, has obtained for us a great many important patents. We have no hesitation in heartily recommending him to anyone having need of the services of a patent attorney." HALLWOOD CASH REGISTER CO. Mr. Parker on November 1, 1903, resigned his position as an Examiner in the U. S. Patent Office to enter this firm. Address, 844 G. St., Washington, D. C. COMPANY Dynamos and Motors, $1 to OHIO ELECTRIC WORKS, Cleveland, Ohio IF YOU OWN or run an AUTOMOBILE you should know how they are built, and the best way to find out is to buy the MOTOR CAR MODEL It consists of Colored Charts bound up with T. W. WHITTAKER, 2 and 3 Bible House CRANE QUICK OPENING SELF NEW YORK PACKING RADIATOR VALVES Crane Quick Opening Self-Packing Radiator Valves are the highest type of Radiator Valves on the market, combining as they do both the Quick Opening and Self-Packing features. The SELF-PACKING feature precludes any possibility of the valve leaking at the stuffing box. They open and close with a half turn of the lever, which can be operated by the foot as well as the hand. The construction of these valves is such, that when closed, the discs bear on the seats very tightly, and the valve is locked in place until released. New York Philadelphia Baltimore Cincinnati St. Louis Kansas City Sioux City St. Paul Omaha Write for Complete Pocket Catalogue CRANE CO. CHICAGO ESTABLISHED 1855 Minneapolis Salt Lake City Los Angeles San Francisco Portland, Ore. Birmingham Seattle Spokane Memphis Dallas Mention Technical World Magazine The Field of Electricity Question 1: Do you think that the electrical field is crowded? Question 2: If any, what other professions offer more opportunities than the electrical? Question 3: What do you think of a college education for an electrical student? Question 4: What good electrical schools, that teach electricity exclusively could you recommend?-E. G. S. Answer 1: The electrical field is probably no more crowded than any other A Scientific Method field in engineering lines. In fact, while of Growing Hair The Evans Vacuum Cap provides the scientific means of applying to the scalp the common sense principles of physical culture. Baldness and falling hair are caused by the lack of proper nourishment of the hair roots. This lack of nourishment is due to the absence of blood in the scalp-an abnormal condition. It is the blood which feeds the hair roots, as well as every other part of the body. If you want the hair to grow on the scalp the blood must be made to circulate there. It is exercise which makes the blood circulate. Lack of exercise makes it stagnant. The Vacuum method provides the exercise which makes the blood circulate in the scalp. It gently draws the rich blood to the scalp and feeds the shrunken hair roots. This causes the hair to grow. Test it Without Expense You can tell whether it is possible to cultivate a growth of hair on your head by ten minutes' use of the Evans Vacuum Cap. We will send you the Cap with which to make the experiment without any expense to you. If the Evans Vacuum Cap gives the scalp a healthy glow this denotes that the normal condition of the scalp can be restored. A three or four minutes' use of the Cap each morning and evening thereafter will produce a natural growth of hair. If, however, the scalp remains white and lifeless after applying the vacuum, there is no use in trying further-the hair will not grow. The Bank Guarantee We will send you, by prepaid express, an Evans A sixteen-page illustrated book will be EVANS VACUUM CAP CO., 1063 Fullerton Bldg., St. Louis the number of students going into this work each year is large, new developments are so rapid that there is room for practically every good man that goes into it. Answer 2: We do not know of any other professions that offer greater opportunities than the electrical, although this is entirely a matter of opinion. Answer 3: We should most heartily recommend a college education for every electrical student who can possibly obtain it. Answer 4: We know of none of the engineering colleges which teach electricity exclusively. The best electrical courses can be found in conjunction with other courses at the standard universities and technical schools. Telephone Generator Question 1: Is there any special way to place the permanent bar magnets of a telephone generator? May either side of the magnets be placed on the same side of the armature or is there a positive or negative side? Question 2: How many ohms resistance is the generator of a telephone wound to, in general? Mention Technical World Magazine WEEKLY MADE SELLING $20 to $50 THIS NEW INVENTION, THE CONSULTING DEPARTMENT (Continued) Question 3: Would you please tell me how to construct a good protection for a telephone STANDARD SELFELLING FOUNTAIN PEN from lightning, one which will not allow $178 -CLEANING No ink dropper. No smeared fingers. No twisted rubber. No complication. 0.90 earned in 82 days by retired business man in Ala. earned in first four weeks by Rev. Gehring, of N, Y.,spare time only. .80 for a month's odd hours $48 $35. by G. Jos. Lovett, of Mass. $5.49 .40 made in first two hours by Mrs. Mary M. Lennon, of Mich. Our free lessons in successful salesmanship make experience unnecessary. We send all particulars and figures to prove above and many other records; write today Energetle Agents and District Managers Wanted. STANDARD PEN CO., 1079Baker Bld., TOLEDO, O. lightning to enter the house? Question 4: Could you please tell me a good method for locating small troubles which frequently occur in telephones? O. J. W. Answer 1: All of the magnets should be placed with like poles side and side for if they were not the electromotive force induced in the armature by cutting the field of one would oppose that inced by cutting the field of the other. Answer 2: The resistance of a generator will vary with its size. The following data represent good practice. BUTCHER'Specific answer. BOSTON POLISH Is the best finish made for FLOORS, Not brittle; will neither scratch nor deface, like shellac or varnish. It is not soft and sticky, like beeswax. Perfectly transparent, preserving the natural color and beauty of the wood. Without doubt the most economical and satisfactory POLISH known for HARDWOOD FLOORS. For sale by Dealers in Paints, Hardware and House Furnishings. Send for our Free Booklet, telling of the many THE BUTCHER POLISH COMPANY 356 Atlantic Avenue, :: :: :: BOSTON, MASS. OUR No. 3 REVIVER is a superior finish for kitchen and piazza floors EVERETT E. KENT COUNSELOR AT LAW Patents, Foreign and Domestic. Copyrights. Trade Marks; State, Federal, and Foreign. Corporations. 84 State Street, BOSTON Mosaic Glass Question. How is Mosaic Glass made?H. D. W. or Answer. Mosaic glass is produced by arranging vertically side by side threads small canes of variously-colored opaque or transparent glass, of uniform lengths, so that the ends shall form a ground representing flowers, arabesques, or any mosaic design. This mass is now submitted to a heat sufficient to fuse the whole, all the sides at the same time being pressed together so as to exclude the air from the interstices of the threads. The result is a homogeneous solid cane or cylinder, which being cut at right angles or laterally, yields a number of layers or copies of the same uniform design. This process was practised with great skill by the ancients, who are supposed to have produced pictures in this way; but in existing specimens, the Mention Technical World Magazine |