manufacturing a patented article and the patent expires is it lawful still to continue to stamp the article 'Patent' with date etc. If s can other parties beside the original manufacturer so stamp them?' Ans—You can continue to use the stamp ; others can use it also. the materials would cost $20; the labor would cost $75 more ; the profit would be $20 more which would make the boiler cost $5. Plenty of persons in this city will make one. You have only to send the order and the funds and It will be made. Provided 50 lbs. Is the mean pressure throughout the stroke; but If the Initial pressure is 60 lbs. and the steam is cut off before the completion of the stroke the engine is of less than 120 horse power. You most multiply by the average or mean pressure throughout the stroke. The rule is correct. a work on mathematical instruments of Henry Carey Baird of Philadelphia. engine slower and carrying higher pressure. But you must in give a mere definite answer without a calculation of some length. You can readily try the experiment without much expense. fuel for generCing steam is its cost. One pound of petroleum will make jutr about as much steam as one and ahall pounds of coal —petroleum therefore must be bought at about nine cents per gallon to be as cheap as coal at ten dollars per tun. Magnesium wire is made by the American Magnesium Co. Boston; price $6 50 Per Ounce. By sifting the powderediglass from out a quantity of gunpowder the explosive properties of the gunpowder are re stored NAVAL ENGINEER. Effeets of Pure Air. Price Nov. 29., scientific american, 1865-12-09
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