. Bulletin - United States National Museum. Science. Figure 17.—Machine used by Alvan Clark & Sons for polishing the 36-inch objective for the Lick telescope. While the lens is evenly rotated, a reciprocating motion is imparted to the tool by the two horizontal arms. A grooved pitch lap lies on the floor in front of the machine. From cover of Scientific American, 24 September 1887. 284-281 O- 59. 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 rese
. Bulletin - United States National Museum. Science. Figure 17.—Machine used by Alvan Clark & Sons for polishing the 36-inch objective for the Lick telescope. While the lens is evenly rotated, a reciprocating motion is imparted to the tool by the two horizontal arms. A grooved pitch lap lies on the floor in front of the machine. From cover of Scientific American, 24 September 1887. 284-281 O- 59. 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 United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
