Popular Mechanics Shop Notes Volume 4-5
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 edition. Excerpt: ...to make teeth and afterwards case-hardened. How to Produce a Minute Hole In Metal Although not of much practical value, but as a trick it may be interesting to know how an exceedingly small hole may be made through a medal or other metal that may not be too hard. On the end of a block of hard wood, the fiber being in a vertical position, lay the medal or other metal. Take an ordinary bottle cork and a fine but straight sewing needle, run the needle lengthwise through the cork from the top and far enough so the point is just visible underneath and no farther. Give the needle a slight kink at the top, thus snapping it off even with the surface of the cork, says the Woodworkers' Review. Stand the cork on the metal to be punctured, with the point of the needle downward, and strike a moderate blow with a hammer squarely on the upper end of the cork, and the needle will instantly be driven through the metal, where it can be removed by a backward blow, thus leaving the minute hole, as desired. in the exhaust nozzle through the stack. It may be made of such a size that the reamer will fit all the exhaust nozzles on the engines running on the division.--Contributed by W. W. Updegraff, Fruitvale, Cal. Making Concrete in Freezing Weather Exhaust Nozile Reamer Concrete may be mixed and placed during freezing weather with perfect safety provided that certain precautions are taken. In mass work, where only light loads will come upon the concrete until such time as it has an opportunity to thaw out and reharden, no precautions need to be taken to prevent freezing. In cases where freezing must be prevented until at least the initial set has taken place, three different methods may be used, separately or in combination, viz.: First, the concrete aggregate...
- 189 x 246 x 8mm | 268g
- 13 Sep 2013
- United States
- black & white illustrations