. Bulletin - United States National Museum. Science. Mason's i \nn. patented in 1H-,4. sho master lead screw driven ai less than work speed so that the master could be ol a co irsei and more durable pitch than the work. patent 10383. imperfections of the operating leading screw, the springing of the leading screw and ol the rod thai is being threaded, .iiul othei unavoidable causes, all of which, although apparent]) trivial and p '.- slight variations in the thread at different parts of the rod 01 blank, a\<- hi sufficient moment to l»- seriousl) considered when a si rew of absolute ,n
. Bulletin - United States National Museum. Science. Mason's i \nn. patented in 1H-,4. sho master lead screw driven ai less than work speed so that the master could be ol a co irsei and more durable pitch than the work. patent 10383. imperfections of the operating leading screw, the springing of the leading screw and ol the rod thai is being threaded, .iiul othei unavoidable causes, all of which, although apparent]) trivial and p '.- slight variations in the thread at different parts of the rod 01 blank, a\<- hi sufficient moment to l»- seriousl) considered when a si rew of absolute ,n 1 urai j is desired. It is interesting to note in figure I'* that Vander Wo id's machine, to avoid the problems outlined in In- patent, has returned to a starkly simple design. We are not told, however, how he originated this master screw which is used to produce the ately threaded work pieces. Later generations, in the search For ever-greatei accuracy, also returned to the fundamental simplicity of a m ister screw as we shall see when we eonsidei the refinements in mechanism necessary to the extended development of the auto- mobile and the airplane. As the power and speed of automobiles and airi rafl increased, critical parts bee ime more highly stressed. Gears and threaded parts were particularly trouble- some details of the mechanism because ol the Stresses concentrated in them. and. in the case ol gears, because ol the internal and external stresses origi- nating in minute deviations from the ideal of tooth form and spacing. The problems were not entirely. 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
