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. 1904 Excerpt: ...or one tenthousandth of an inch. When a line on the thimble coincides with the third line (end of second division) on the veriner, the caliper has been opened two ten-thousandths of an inch, etc. Note the right hand cut of graduations, where the line on the thimble coincides with the fourth line (end of third division) and the reading is three one-thousandths of an inch. To read the caliper, note the thousandths as usual, then count the number of divisions on the veriner, commencing at the left, until a line is reached with which a line on the thimble coincides. If the second line, add one ten-thousandth, if the third, two tenthousandths, etc. SPECIAL USES OF MICROMETER-CALIPERS. Besides the uses for which the micrometer was primarily designed and is generally used, there are any number of special uses to which (he caliper can be put: In the following I enumerate and describe a number which will no doubt be the means of suggesting many others. In order to determine whether the dead centre and the live centre of a lathe are in line: First, set the centres as near as possible by eye; then carefully centre a piece of stock about six inches long; place it on the centre and turn one end for a distance of about one-half inch, using a sharp-edged tool so as to get a smooth surface. Then reverse the stock so that the turned end will be at the live centre. Next, turn the other end to exactly the same diameter, using the micrometer to gauge it. Now clamp the micrometer to the cross-slide of the lathe, so that the end of the barrel or ratchet-stop will rest against the work, as shown in Fig. 297. You can now set your centres accurately by running the barrel out against the nearest end, noting the reading and running back the barrel, running the carriage up to the othe...
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