Good Business English SPACE THAT PAYS is the space that brings results. The Technical World In spite of this increase our The Technical World is of interest to everybody-is The Technical World We hold the confidence of our The Technical World 3321 Armour Avenue CHICAGO, ILLINOIS These books teach salesmen how to write convincing letters that sell goods, teach credit men how to write tactful letters that bring in money and give no offense, teach correspondents how to write forceful business-bringing letters, teach stenographers how to master correspondence, teach advertisement writers how to write strong, "pulling" copy. They form a complete college course in business English-to be read at leisure-to be put into daily practice at once. Many successful men are earning large salaries merely because they know how to state a business proposition clearly, tersely, concisely, forcefully. This set of books comprises the notable Sherwin Cody course in business English complete. 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To subscribers of SYSTEM, however, we will send the books at less than half the regular cost. Send $2.00 for SYSTEM and $1.00 for the books, and we will enter your name for one year of SYSTEM (including the free expert service), and will express you the books in a case at once, every cost prepaid. Send the $3.00 to-day. Tear out this advertisement and WRITE YOUR NAME BELOW The Armour Glue Works, Chicago, 111. "I find I cannot get along without SYSTEM. It is the best and most comprehensive magazine of its class. Full of 'new blood' ideas, nothing antiquated." W. E. JOHNSON, JR. Peoples Saving and Loan Association Company, Leetonia. Ohio. "A single article is frequently worth much more than the price of a year's subscription." C. E. GREENAMYER. "When I am at home Sherwin Cody's books are always on my study table. I never travel without one of them in my grip. With them at hand, every spare moment can be improved to decided financial advantage." CLOWRY CHAPMAN, Advertising Expert. "You certainly give big value for the money." JOHN LEE MAHIN, President Mahin Advertising Co. Send with Three Dollars at our risk to THE SYSTEM COMPANY 992 First National Bank Building, Write Your Name and Address Here. CHICAGO GRADUATE AND STUDENT NOTES-(Continued) A GOOD IDEA of the difficulties many of our students in foreign lands overcome in the mastery of their studies is found in a letter from Mr. Francisco del Salaya, Madrid, Spain. In referring to his method of work, he writes: "I translate with a Spanish-American dictionary the subject-matter of the lesson, and afterwards work out the questions with pencil, always being guided by the instructions in the Instruction Papers. When I have the problems solved, I copy them on the Examination Papers." MR. C. HARRISON DICKSON, Germiston, Transvaal, South Africa, is employed in the Engineering Department of A SNAPSHOT FROM THE TRANSVAAL. Mr. C. H. Dickson is the gentleman seated. a large gold mine. During the war in the Transvaal he served with the Johannesburg Mounted Rifles. Was promoted to Sergeant of the Machine Gun Section, and during his term of service was responsible for the good working order of the mechanism of the guns. MR. J. D. JACKSON, of Chicago, Ill., has recently been elected President of the N. A. S. E., No. 2. He has been extremely active in engineering circles. Through his influence many excellent programs have been arranged, and his election to the presidency indicates that his work has been appreciated. CHARLES T. BENSON has recently patented a rotary engine for which he claims no waste of steam, and good mechanical contact. Patents have already been se cured in the United States and France, and are now pending in Canada. Engineers will look forward to this new invention in the hope of seeing a rotary engine on the market that will be economically a success. MR. T. B. MATTHEWS, of Labosa, Fiji, is one of the engineers in the wellknown Colonial Sugar Refining Company, whose factories are in the Fiji Islands. In a recent letter referring to his busy life, Mr. Matthews says: "I generally go into a mosquito-proof room by myself, and spend the evening studying until bedtime." Speaking of his studies, our friend in these far-off islands writes as follows: "My knowledge of engineering has greatly increased since I have been a member of the School. I reckon every man in the trade ought to take a course; and certainly those who do will never regret it." MR. H. O. JACOBSON, recently of Minneapolis, Minnesota, passed with high grade the Civil Service Examination for a first stationary engineer's license. Nothing pleases the American School so much as to see students forge ahead. IN ORDER to gain a practical knowledge, H. M. Patch of Stevens Point, Wisconsin, has been assisting in the running of a 250-H.-P. compound-condensing engine and T. H. alternating-current dynamo and Excelsior arc machine. J. T. GASKILL, Philadelphia, Pa., has had the entire supervision of the installation of a new steam plant. GEORGE TOPPING, Milwaukee, Wisconsin, a graduate in two courses, holds the responsible position of engineer in the well-known Wells building in Milwaukee. JAMES J. JENSEN, Vallejo, Cal., is working as a wireman in order to gain practical experience. At the same time, he is pursuing postgraduate work to keep informed on all the latest and best practice. If there is Life in his Printing there is Business for the Advertiser ¶Printed matter with Life The Printing That Brings Results Try W. P. DUNN COMPANY, 167 Adams Street, Chicago Catching and Stretching Threads How to Overcome Some of the Difficulties Encountered in Machine Shop Work By O. C. BICKFORD A Student of the American School of Correspondence OSSIBLY a method of "catching" threads which I have recently used may be of interest to some of your readers, so I shall give it to you. We have occasion to thread large quantities of staybolt taps, and a new lathe was bought for this purpose, which, upon arrival, was found to have an 8-pitch lead screw. As we wished to cut a thread of 12 pitch (which most staybolts have), and must make several cuts over the tap to get a finished thread, it seemed desirable to provide some means of making sure to set in at the right position. Accordingly I made a small worm gear, having 32 teeth fitted to mesh into the lead screw of the lathe. This I put on a short stud, run the stud up through a small block which serves as a bearing, and then fastened the block to the back end of the lathe-carriage so that the wheel would always remain in mesh with the screw. I then put a small disc, about 11⁄2 inches in diameter, on top of the stud, graduated this disc with 4 division lines, set a pointer to the edge of the disc, and the device was complete. As the stud carrying the worm and disc is attached to the lathe-carriage, the stud is revolved by means of the lead screw turning the worm wheel when the carriage is at rest; and then, when the nut is closed around the screw and the carriage advances, the stud becomes a stationary part of the carriage, the lead screw turning in the edge of the worm wheel as it does in the closed nut. This makes it possible to know, before settingin the threading tool, if an error has been made, because the disc stops revolving as the nut is closed, and the exact position of the pointer may be noted. As the lead screw was 8-pitch and the worm wheel had 32 teeth, each graduation line on the disc represented one inch in the travel of the carriage. For whole threads the nut can be closed with the pointer at any division line; while for half threads as 42, etc., it is necessary to close the nut when the indicator points either to the division line first used or to the one opposite, these two representing points two inches apart on the screw. I am informed that this device is in use on some makes of American lathes, though when I made this I never had seen one nor a description of it. And now in regard to "stretching" threads, we had previously been threading these taps in lathes having a screw with stretched thread, but found it inconvenient to get such a screw for this new lathe, so set about to get the required pitch by means of the gears. Perhaps not all of your readers know the reason for our wishing to get a stretched thread; and if so, here it is: Steel when hardened decreases somewhat in length; and as staybolts are not hardened after threading (being usually 12 threads per inch), it becomes necessary to cut a thread of such a pitch that, after hardening the tap, the thread will measure up 12 to the inch. By careful measurements of several taps before and after hardening, I found that they decreased in length about .004 per inch. So, by a little calculation, I found that to secure a thread that would be 12 pitch after the tap was hardened, I must cut a thread having a pitch of 11.952 threads to the inch. I decided to approximate this at 11.95. as I found that I could cut a thread of this pitch in the following manner-by setting up the lathe with such gears that having one of 240 teeth on the screw I |