. The railroad and engineering journal . The manwho would run a polygonal journal in a polygonal bear-ing as an approximation, in place of a circular journalin a circular bearing, would show fully as much sense asthe man who makes gear teeth with portions of circles, orwith cycloids or involutes, or any other poor approxima-tion. When the mechanical world, finding that such resultsare attainable without difficulty, demands gear that runas close, smooth, noiseless, and perfect in all their actionas a fine-fitted circular journal in a circular bearing, thenmechanics will make such gear, and thos
. The railroad and engineering journal . The manwho would run a polygonal journal in a polygonal bear-ing as an approximation, in place of a circular journalin a circular bearing, would show fully as much sense asthe man who makes gear teeth with portions of circles, orwith cycloids or involutes, or any other poor approxima-tion. When the mechanical world, finding that such resultsare attainable without difficulty, demands gear that runas close, smooth, noiseless, and perfect in all their actionas a fine-fitted circular journal in a circular bearing, thenmechanics will make such gear, and those gear teeth willbe Hypercycloidal. Aloha Vivarttas. Gresham & Cravens Combination Automatic Injector. The accompanying engravings, figs, i, 2, 3, and 4,which, with the description, are taken from the most recent form of what is called the com-bination automatic injector, manufactured by Gresham &Craven, of Manchester, England, and figs. 5 and 6 showthe method which has been adopted by Mr. Francis R. F. fi. COMBINATION .\UT0MATIC INJECTOR. Brown, Mechanical Superintendent of the Canadian PacificRailway, in applying it on that road. It will be seen fromthe illustrations that openings have only to be made at oneplace in the boiler, and the instrument is complete in it- 344 THE RAILROAD AND [August, self, being provided with, as its name implies, all the nec-essary valves, viz., a steam valve, a back-pressure valve,a stop valve, a water valve, and a warning cock ; it never-theless barely exceeds in size and weight the common typeof injector. With injectors previously introduced it hasbeen found necessary, when they were to be used as lift-ing injectors, to fit them with a needle-shaped spindle forthe purpose of adjusting the steam when lifting the water,and they have not, therefore, been commonly adopted onlocomotives. With the new injector this spmdle has beendispensed with, and the instrument is fitted at a levelabove that of the water in the tender
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Keywords: ., bookcentury1800, bookdecade1880, bookidrailroadengi, bookyear1887
