. American engineer and railroad journal . 0: F. atthe uptake end. the- Servt- tube transmitted 6,000 Britishmal units per square foot per hour, and the plain tube 4,500British thermal units per square foot per hour. The areameasurements were made on the outside or emission surfacesof the tubes. From these experiments it would seem that theServe ribs are very efficient heat collectors when hot gases arepassed through the tubes.—Engineering. 492 THE AMERICAN ENGINEER [November, 1694. Hand Boiler Punch. —Tn another column of this issue wepublish a description of a combined screw and hydraulic pr
. American engineer and railroad journal . 0: F. atthe uptake end. the- Servt- tube transmitted 6,000 Britishmal units per square foot per hour, and the plain tube 4,500British thermal units per square foot per hour. The areameasurements were made on the outside or emission surfacesof the tubes. From these experiments it would seem that theServe ribs are very efficient heat collectors when hot gases arepassed through the tubes.—Engineering. 492 THE AMERICAN ENGINEER [November, 1694. Hand Boiler Punch. —Tn another column of this issue wepublish a description of a combined screw and hydraulic press in use at Corning, N. Y. The punch which is here illustratedworks upon the same principle, but needs a slight addition, inorder to make it thoroughly acceptable and satisfactory. The principle upon which it works is that the hand screw is drivendown into the chamber .I, which is filled with grease, causinga certain pressure per square inch to I- exerted upon it ; thispressure is transferred to the end of the punch, which is larger. COMBINED SCREW AM) II V IlIiA IM! ITNC11. on the screw end, and therefore subjected to a greater pressurethan that exerted by the screw ilscIT. It will be seen that thescrew is very long ; and when it. is new and well fitted nol much trouble is caused by the grease working back up the threads, but as soon as it becomes worn leakage occurs, andthe etliciency of the punch is correspondingly diminished, Ifthis were arranged with the packing by the screw it would be a very valuable little tool for punching through moderate thicknesses of metal, for which nothing but hand power isavailable. The Failure of Torpedo Boats in the Manoeuvres of theBritish Fleet.—A correspondent oi the London Times, whodescribed the recent manoeuvres of the Beet, comments as fol-lows on the elTectiveness or, rather, non-effectiveness of thetorpedo-boats : A subsidiary feature of the manoeuvres, of no little interestin itself, is the total failure of the torpedo-boats
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
