principle as the The hollow spindle allows bolts of any length to be threaded, has recently successfully used bicarbonate of soda as a re- dies—that of interchangeability—the cutting portions being and the geared head and three-graded cone give great power medy for severe toothache, when… … A larger machine, similar in construction seems every reason for the truth of the above and operation, has a range for threading bolts author’s conjecture. Doubtless on the same from $inchto 14 inchesin diameter. Thisis known as the No. inserted in longitudinal slots on the body of the tap, so that…
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