Shaft governors, centrifugal and inertia; simple methods for the adjustment of all classes of shaft governors . was not recognized until theshaft governor had been pretty well developed, but astudy of the drawings of some of the early types ofgovernors show that they were constructed and oper-ated in such manner as to have the full benefit ofinertia to aid in the regulation. This seems to havebeen notably true in the case of the governor shownby Professor Sweet at the Centennial Exposition. The records of the American Patent Office in refer-ence to the shaft governor are of much interest, butt
Shaft governors, centrifugal and inertia; simple methods for the adjustment of all classes of shaft governors . was not recognized until theshaft governor had been pretty well developed, but astudy of the drawings of some of the early types ofgovernors show that they were constructed and oper-ated in such manner as to have the full benefit ofinertia to aid in the regulation. This seems to havebeen notably true in the case of the governor shownby Professor Sweet at the Centennial Exposition. The records of the American Patent Office in refer-ence to the shaft governor are of much interest, buttime will not permit any extended reference to these EVOLUTION OF THE SHAFT GOVERNOR IS records. A few of the earlier patents are, however,considered of so much importance that drawings aresubmitted and quite full references are given. Theseearly patents do not, probably, represent any practicalapplication, but they are interesting as showing acomplete understanding, not only of the theory of theshaft governor, but of methods of application topractical work. The earliest reference which I have been able to. FIG. 5 find to the shaft governor is shown in a patent grantedJ. D. Custer, June 21, 1839 (Figs. 5 and 6). Fromthese it will be seen that it consisted of two balls orweights symmetrically disposed in the fly-wheel and ingravity balance and pivoted to radial arms and con-nected by links with the eccentric in such a mannerthat the action of the centrifugal force would causethe balls to fly out, and this action would twist the i6 SHAFT GOVERNORS eccentric on its center so as to reduce the travel ofthe valve. The action of the centrifugal force wasopposed by a flat spring. The drawing indicates aform of a governor which should have been of practicalutility, but I have not been able to find, however, thatthe governor patented by Custer was ever put into
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