. Bulletin. Science. Figure 22.—Peaucellier exact straight- line linkage, 1873. From A. B. Kempe, How to Draw a Straight Line (London, 1877, p. 12).. Figure 21.— Top: Chebyshev straight- line linkage, 1867; from A. B. Kempe, How to Draw a Straight Line (London, 1877, p. 11). Bottom: Chebyshev- Evans combination, 1867; from Oeuvres de P. L. Tchebychef (St. Petersburg, 1907, vol. 2, p. 94). Points C, C, and C" are fixed. A is the tracirig point. "the motion is of little or no practical use, for we can scarcely imagine circumstances under which it would be more advantageous to use such
. Bulletin. Science. Figure 22.—Peaucellier exact straight- line linkage, 1873. From A. B. Kempe, How to Draw a Straight Line (London, 1877, p. 12).. Figure 21.— Top: Chebyshev straight- line linkage, 1867; from A. B. Kempe, How to Draw a Straight Line (London, 1877, p. 11). Bottom: Chebyshev- Evans combination, 1867; from Oeuvres de P. L. Tchebychef (St. Petersburg, 1907, vol. 2, p. 94). Points C, C, and C" are fixed. A is the tracirig point. "the motion is of little or no practical use, for we can scarcely imagine circumstances under which it would be more advantageous to use such a complicated system of levers, with so many joints to be lubricated and so many pins to wear, than a solid guide of some kind; but at the same time the arrangement is very ingenious and in this respect reflects great credit on its ; '^ There is a persistent rumor that Professor Chebyshev sought to demonstrate the impossibility of constructing any linkage, regardless of the nuinber of links, that. 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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