REMINGTON TYPEWRITER CO. NEW YORK and EVERYWHERE. Hero of Thirty Years' War FRED MEDART 8545 DeKalb Street St. .Loubi Mo. AMERICAN ACETYLENE STOVE CO. pump. Runs any kind of tnachin tion. Most reliable in work. Don't t THE AIR-COOLED MOTOR CO. Lansing Mich. Has no pumps no valves. No piping required to supply it with water Always ready for use. Sim plest in construction most efficient MACHINES FOR ROLLINC SCREW THREADS. .Notes HINTS TO CORRESPONDENTS. Names and Address must accompany all letters or no attention will be paid thereto. This is for our information and sot for publication. date of


REMINGTON TYPEWRITER CO. NEW YORK and EVERYWHERE. Hero of Thirty Years' War FRED MEDART 8545 DeKalb Street St. .Loubi Mo. AMERICAN ACETYLENE STOVE CO. pump. Runs any kind of tnachin tion. Most reliable in work. Don't t THE AIR-COOLED MOTOR CO. Lansing Mich. Has no pumps no valves. No piping required to supply it with water Always ready for use. Sim plest in construction most efficient MACHINES FOR ROLLINC SCREW THREADS. .Notes HINTS TO CORRESPONDENTS. Names and Address must accompany all letters or no attention will be paid thereto. This is for our information and sot for publication. date of paper and page or number of question. Inquiries not answered in reasonable time should be repeated; correspondents will bear in mind that some answers require not a little research eind though we endeavor to reply to all either by letter or in this department each must take his turn. Buyers wishing to purchase any article not adver tised in our columns will be furnished with addresses of houses manufacturing or carrying the same. Special Written Information on matters of personal rather than general interest cannot be expected without remuneration. Scientific American Supplements referred to may be had at the office. Price 10 cents each. Books referred to promptly supplied on receipt of price. Minerals sent for examination should be distinctly marked or labeled. gines marine type will work satisfactorily Kerosene oil engines are more difficult to suc cessfully operate under all conditions than perienced persons give more trouble we be lieve ; but on the other hand they are much less expensive to run. We think you would be safer with the gasoline engine but we as you ;mention have given most satisfactory service. broken. A. 1. Bring the edges of the pieces it first on a white piece of paper. 2. Small in the following manner : Slope off the mar iron press and immerse in boiling water for some time. The pieces by this means become seen. The filings and very small scraps may be oft


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