. Bulletin. Science. Figure 41.—Scotch yoke, described as a "crank and slot-headed sliding ; From W. J. M. Rankine, A Manual of Machinery and Millwork (ed. 6, London, 1887, p. 169). its own intrinsic merit," as Ackermann predicted it would.'"* The Whitworth quick-return mechanism (fig. 44) was first applied to a slotter, or vertical shaper, in 1849, and was exhibited in 1851 at the Great Exhibi- ts Rudolph Ackermann, Observations on Ackermann's Patent Moveable Axles, London, 1819. It was interesting to me to note an abstract of W. A. Wolfe's paper "Analytical Desig
. Bulletin. Science. Figure 41.—Scotch yoke, described as a "crank and slot-headed sliding ; From W. J. M. Rankine, A Manual of Machinery and Millwork (ed. 6, London, 1887, p. 169). its own intrinsic merit," as Ackermann predicted it would.'"* The Whitworth quick-return mechanism (fig. 44) was first applied to a slotter, or vertical shaper, in 1849, and was exhibited in 1851 at the Great Exhibi- ts Rudolph Ackermann, Observations on Ackermann's Patent Moveable Axles, London, 1819. It was interesting to me to note an abstract of W. A. Wolfe's paper "Analytical Design of an Ackermann Steering Linkage" in Mechanical Engineering, Sep- tember 1958, vol. 80, p. Figure 42.—A "Scotch" supporting the top member of a string of well- drilling tools while a section is being added, 1876. From Edward H. Knight, Knight's American Mechanical Dictionary (New York, 1876, p. 2057). 222 BULLETIN 228: CONTRIBUTIONS FROM THE MUSEUM OF HISTORY AND TECHNOLOGY. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution; United States. Dept. of the Interior; United States National Museum. Washington, Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off
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