. Appleton's dictionary of machines, mechanics, engine-work, and engineering. Fig. 3675 is another form of hollow trilateral rail, slightly differing from the preceding. Fig. 3673 represents a cylindrical tube. Fig. 3674 is a taper tube, the interior and exterior being of uniform taper, and of equal thickness ofmetal throughout. • Fig. 3672 represents a tube tapered exteriorly, and cylindrical interiorly, and of an equal thicknessof metal. Mandrils may be employed or not in the above modes of manufacturing tubes, as convenient. The next improvement relates to the manufacture of spiral or helic
. Appleton's dictionary of machines, mechanics, engine-work, and engineering. Fig. 3675 is another form of hollow trilateral rail, slightly differing from the preceding. Fig. 3673 represents a cylindrical tube. Fig. 3674 is a taper tube, the interior and exterior being of uniform taper, and of equal thickness ofmetal throughout. • Fig. 3672 represents a tube tapered exteriorly, and cylindrical interiorly, and of an equal thicknessof metal. Mandrils may be employed or not in the above modes of manufacturing tubes, as convenient. The next improvement relates to the manufacture of spiral or helical metal tubes. This improve-ment is illustrated in Fig. 3676, which represents an elevation of the apparatus. The apparatus con- sists of a pair of rollers PP, mounted one above the other in (he framing Q, Q, the bearings in whichthe rollers revolve being in the uprights Q1 Q1 of the framing, and the mode of attachment to the bear-ings being such that the rollers may bo removed or replaced with facility, as it is necessary to removethe rollers from the frame before the spiral or helical tubes can be removed from the rollers. Theserollers are geered together at one end by the geering-wheols 1 .1, so that they revolve in unison. Theperipheries of the rollers are formed with spiral grooves T T, around which the direction of the spiralof one is in one direction, and that of the other is in another direction, so that as the rollers revolve, thegrooves of one always coincide with the grooves of the other, and the two together form the exteriorof the spiral tube, as is the case with grooved rollers generally. The grooves maj be of any form soas to manufacture the spiral or helical tubes of any form of cross-section de
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
