Author Description

Product description This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 edition. Excerpt: ... boss around the center-hole. Mention has been made of the possibility of a crack extending on the inside of a piece where it is not visible on the outside. A good illustration of this is shown in Figs. 26 and 27, which show a piece broken out of an automobile cylinder jacket in order to weld the dome. In Fig. 26, a crack was visible at the top and bottom of the piece as a very fine line, but it was not visible for more than f inch in either case on the outside of the piece. However, it will be noticed that it extends along and is quite clearly visible inside in Fig. 27. This condition may exist not only in cylinder jackets, but in many other pieces, both large and small, and the illustrations are shown to emphasize the necessity of following the crack all the way to the end. Defective Welding of Cylinders.--As an illustration of what results from improper welding of cylinders, Figs. 28 to 30 are shown. The original damage to this cylinder is indicated in Fig. 28, and consisted of a crack in the dome. From the appearance of the inside of the cylinder shown in Fig. 29, the dome appears to be broken in a number of pieces. It does not appear on examination of the cylinder whether the jacket was cut out in order to reach the broken dome, or whether it was broken out originally by the damage. However, in attempting to put it back, the cracks kept on extending until the cylinder was cracked through two port plug holes. In addition to this, the corner of the cylinder as welded was much natter than it should be, the result being that it would have been impossible to grind out the cylinder without going through the weld. In addition to the above, there was no attempt made to smooth off the inside of the dome, with the result that the cylinde