IMPROVED DOOR GUARD. which is so simple in its construction and the use of which is so obvious that it is in connection with the engraving scarce ly necessary to describe it. it consists of a stud screwed to the wash-board behind the door and tipped with a hollow elastic rubber ball or cushion against which the door swings when opened and which pre vents noise and prevents any injury to the door or to the wall from the concussion or from the striking of a key which may be left in the lock of the door. Patented through the Scientific American Patent Agency May 17 1870 by Charles William G schwind of whom fur ther particulars may be had by addressing him at Port Re public N. J. Defects in Locomotive Boilers. It will be well to notice an objection constantly urged by those who believe in the excellence of the locomotive boiler which may be thus stated :—' The boiler can only be un economical by wasting heat but if it wastes heat that heat will be found in the smoke-box ; it will manifest its presence in the high temperature of the escaping gases. But there is not a high temperature of the smoke-box therefore heat is not wasted.' This is a very logical proposition which breaks down only at the end. No one knows accurately what the temperature is in the smoke-box. So long as an engine is not heavily taxed and the draft is moderate it is indisputable that the temperature especially if the tubes be long and small is low ; and there can be no question that engines moderately loaded and running at low speed evaporate more water per pound of coal provided combustion be perfect than does an express engine careering across country at fifty miles an hour with ten or a dozen heavy carriages behind it. The boiler quickly falls off in efficiency as the quantity of coal burned increases and this is no doubt one reason why the cost of transport increases so rapidly in proportion to the speed albeit it is one which has not received half the atten tion it deserves. But to return to f
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IMPROVED DOOR GUARD, simple, construction, obvious, connection, engraving scarce ly necessary, describe, consists, stud screwed, wash-board, door, tipped, hollow elastic rubber ball, cushion, door swings, opened, pre vents noise, prevents any injury, door, wall, concussion, striking, key, left, lock, door, Patented, Scientific American Patent Agency, 17 1870, Charles William G schwind, whom fur ther particulars, addressing, Port Re public N, J, Defects, Locomotive Boilers, will, well, notice, objection constantly urged, believe, excellence, locomotive boiler, thus stated, —', boiler, economical, wasting heat, if, wastes heat, heat will, smoke-box, will manifest, presence, high temperature, escaping gases, But, high temperature, smoke-box, heat, wasted.', a, logical proposition, breaks down, No, knows accurately, temperature, smoke-box, long, engine, heavily taxed, draft, moderate, indisputable, temperature, if, tubes, long, small, low, no question, engines moderately loaded, running, low speed evaporate, water, pound, coal provided combustion, perfect, express engine careering across country, fifty miles, hour, ten, dozen heavy carriages, boiler quickly falls off, efficiency, quantity, coal burned increases, no doubt, reason why, cost, transport increases, rapidly, proportion, speed albeit, received half, atten tion, deserves, But, return, f, science, scientific, sciences, mind, health, tech, sustainability, publication, lab, sciam, sa, scientist, research, american, experiment, education, discovery, technology, analysis, magazine, u.s., insights, developments, weekly, broadsheet, inventor, innovation, inventions, patented, industrial revolution, emerging, trends, monthly magazine, united states, engravings, curious works, paper, discover, Scientific Paper, Weekly Journal, Practical Information, Art, Science, Mechanics, Chemistry, Manufactures, research, education, scientist, innovation, 19th century, vintage, america, Rufus M. Porter, 1845, journal, academic, newspaper illustrations, retro style, old-fashioned, media illustrations, victorian style, news, newspaperheadline, 19th century style, illustration, journalism
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