. Carnegie Institution of Washington publication. Fig. 23. SPECIAL LATHE-CHUCK USED IN THE CONSTRUCTION OF THE BOMB. The construction work has been greatly facilitated by the use of a special lathe-chuck. This is shown in vertical section in fig. 10. It is a cup-shaped piece of cast iron which at the lower end screws on to the spindle of the lathe. The upper end is made to take the thread on the shell of the bomb. All of the finishing of the shell, both at the top and bottom, is done with the latter screwed into this chuck, with the result that the bomb can at any time be brought into the
. Carnegie Institution of Washington publication. Fig. 23. SPECIAL LATHE-CHUCK USED IN THE CONSTRUCTION OF THE BOMB. The construction work has been greatly facilitated by the use of a special lathe-chuck. This is shown in vertical section in fig. 10. It is a cup-shaped piece of cast iron which at the lower end screws on to the spindle of the lathe. The upper end is made to take the thread on the shell of the bomb. All of the finishing of the shell, both at the top and bottom, is done with the latter screwed into this chuck, with the result that the bomb can at any time be brought into the lathe so as to run perfectly true. 24. A NEW COMPOSITE LINING FOR THE BOMB. The original form of the platinum lining of the lower part of the bomb was, when once in place, perfectly satisfactory for work up to 306°. But for higher temperatures the lining always leaked at the curved portion near the bottom. This was doubtless due to the unequal expansion upon heating of the shell and lining. These were fastened together by the screws and packing-ring at the upper end and by the electrode at the lower end. Upon heating there was a tendency for the steel, which expands more than platinum, to draw away from the latter, leaving it unsupported at the bend. The effect of this was not evident up to 306°, but at higher temperatures it caused a very bad leak, for at these temperatures water passes freely through the pores of the platinum at any unsupported place. Moreover, there was always a great deal of difficulty in originally fitting the lining to the curved portion of the bottom, so that upon first applying the hydraulic pressure the lining often tore at this point. These difficulties are entirely obviated by doing away with the curved portion, thus making the bottom flat, and by using a lining made in. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may no
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