HINTS TO CORRESPONDENTS. no attention will be paid thereto. This is for our information and not for publication. answered in re w his turn. tised in our columns will be furnished with the same. without remuneration. had at the office. Price 10 cents each. price. marked Or labeled. horizontal tubular boilers 48 inches by 12 feet -I- 90 pounds steam pressure on boilers running two engines of 50 horse power each. The past year he used 450 tons bituminous coal to operate the two boilers. What would he save in coal should he install one boiler 66 inches by 18 feet doing the same work as the other two boilers now in use? A. It would require just as much coal to develop 100 horse power from one boiler as it would from two 50 horse power boilers if all other conditions were the same. In installing a new plant it would be probable that some improvements could be made over an old plant but no direct gain would come from. having one boiler instead of two to do the work. 450 tons of bituminous coal per year does not impress us as 'being a large amount of coal to develop 100 horse power for ten hours a day and 300 days in a year. tell me where I can get information concern I. mean the government regulations and rules? A. If you will address the Secretary of the Treasury Washington D. C. he will mall you the United States government regulations and rules regarding the use of steam launches and The conditions under which licenses are neces sary and can be obtained. for finding center of the ends of shafting etc. Also number of SUPPLEMENT on the combina tion square. A. We would say that the com monest and best tool for this purpose is what sists of a square with a long blade bisecting the 90-degree angle of the square. This square is used on the end of a shaft much as a T-square is used on a drawing board and by means of it a diameter of the end of the shaft can al ways be accurately drawn. By turning the square on the shaft another diameter approxi mately at right angles to the fi
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