drills being at automatically, the instant a fire occurs, by the action of necessity be so also, seeing the centers coincide. work on each line, then the slides are again placed so ‘of the heat; and this problem may be considered not as to suit a new set, and so on until the whole of the When the… … Fig. 5.-SECTION OF TUBE AND MANDREL. heads always point to the center of the tube, whereas In tests that have been made, results have shown that in the case just mentioned the holes require to be the weight may be reduced sixteen per cent by boring, drilled at right angles to the special or flat…
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