. The Scientific American reference book; a compendium of useful information for inventors and mechanics, containing the complete patent laws of the United States ... forms for patents, caveats, assignments, licenses, and shop rights ... etc., etc . dy patented abroad, the inventor willbe required to make oath that, according to the best of hisknowledge and belief, the same has not been in public usein the United States for more than two years prior to theapplication in this country. An applicant whose invention has been patented abroad,should state the fact that a foreign patent has actually
. The Scientific American reference book; a compendium of useful information for inventors and mechanics, containing the complete patent laws of the United States ... forms for patents, caveats, assignments, licenses, and shop rights ... etc., etc . dy patented abroad, the inventor willbe required to make oath that, according to the best of hisknowledge and belief, the same has not been in public usein the United States for more than two years prior to theapplication in this country. An applicant whose invention has been patented abroad,should state the fact that a foreign patent has actually beenobtained, giving its date, and if there be more than one, oftWa one having the shortest term. The best engines and boilers develop a horse-power perhour by the consumption of two pounds of coal. But thisis better than the average ; and three pounds of coal perhorse-power, per hour, is a more common result. 118 THE CONDENSING ENGINE. THE STEAM-ENGINE. Every mechanic and inventor should make himself generally familiar with the construction and operation of thesteam-engine. To assist them in gaining this knowledge,we subjoin for reference a diagram of the common Con-densing Engine, with letters of reference to the names ofthe various parts:. «, steam cylinder ; 6, piston; c, upper steam port or pas-sage ; d^ lower steam port; e e, parallel motion ; ff, beam;ff, connecting rod; A, crank; i ^, fly-wheel; k k, eccentricand its rod lor working the steam-valve ; I, steam-valve andcasing; w, throttle-valve ; w, condenser ; o, injection-cock ;p, air-pump ; g, hot well; r, shifting-valve to create vacuumin condenser previous to starting the engine; 5, feed-pumpto supply boilers ; t, cold-water pump to supply condenser ;u, governor. A study of the above diagram and descrip-tion, in connection with attentive observation of engines inmotion, will be of much assistance in acquiring a generalunderstanding of the machine. We recommend the follow- HINTS TO LETTER-WKITEES. 119 ing standard w
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