The wonders of modern mechanismA résumé of recent progress in mechanical, physical, and engineering science . he tool that isnever likely to be superseded. It has been considerablyimproved since the days of Naysmith, the inventor. Thereare two types of direct-acting steam-hammers now made,—one in which the weight of the falling mass is concen-trated in a head, or which works between guiding surfaces,and is connected by a piston-rod of relatively small diam-eter with the steam-piston in a cylinder situated above other type, known as the Morrison, arranges the fall-ing mass in the form of
The wonders of modern mechanismA résumé of recent progress in mechanical, physical, and engineering science . he tool that isnever likely to be superseded. It has been considerablyimproved since the days of Naysmith, the inventor. Thereare two types of direct-acting steam-hammers now made,—one in which the weight of the falling mass is concen-trated in a head, or which works between guiding surfaces,and is connected by a piston-rod of relatively small diam-eter with the steam-piston in a cylinder situated above other type, known as the Morrison, arranges the fall-ing mass in the form of a heavy cylindrical bar, of whichL o 21 256 WONDERS OF MODERN MECHANISM. the piston is an integral part, and is situated near the cen-tre of the length, so that the bar extends above the pistonand passes through the upper cylinder-head. The latterstyle is generally preferred, as the bar is better able towithstand the shocks of concussion than a piston-rod. Inthe smaller sizes the mechanism is supported on a singlebent column. In the larger sizes the falling-bar operatesbetween two stupendous WM. SELLERS & TOOL-GRIKDER. The grinding of drills is very particular work, as, if im-properly done, the holes made will not be uniform. Special MINING AND MINING-MACHINERY. 257 machines have been built to do this work, and one of themis here It is supphed with a cooling streamof water, so that it is not necessary to draw the temperfrom the drills. Such are a few of the more important machines used inthe manufacture of other machines. Anything like a com-plete description of them would fill a work several timeslarger than this. As a rule, these machines are built bet-ter in America than abroad. Hiram S. Maxim, the in-ventor of the Maxim gun and flying-machine, himself anEnglishman, has put himself on record as saying that thisnation has the best mechanics in the world, and the manwho investigates some of the large and excellently designedmachine tools of t
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