. Bulletin - United States National Museum. Science. Figure 26.—Original model of the 621-type yoke- and penta-contact chamber for use on Small Price current meters. Details of the inner parts of the contact chamber are the same as those in figure 27. The instrument is now in the Smithsonian's Museum of History and Technology. (USNM cat. no. 289645; Smithsonian photo 44538-B.) up with them without an electric counter. That situ- ation reached a climax at the second annual confer- ence of the Survey's eastern hydrographers in January 1905. The minutes of that conference show that a recommendati
. Bulletin - United States National Museum. Science. Figure 26.—Original model of the 621-type yoke- and penta-contact chamber for use on Small Price current meters. Details of the inner parts of the contact chamber are the same as those in figure 27. The instrument is now in the Smithsonian's Museum of History and Technology. (USNM cat. no. 289645; Smithsonian photo 44538-B.) up with them without an electric counter. That situ- ation reached a climax at the second annual confer- ence of the Survey's eastern hydrographers in January 1905. The minutes of that conference show that a recommendation was made to the efifect that a current meter should be constructed for use in flood measure- ments that will record once every 5, 10, or 20 revolu- tions. It may be remembered at this point that Price's Acoustic meter had an impeller with the same dimen- sions as those of the Small Price meter. No fault was found with it in this respect, because, as previously explained, that meter produced one click for every 10 revolutions of its impeller. With it, the hydrographer easily could count those revolutions by tens, even under the most severe velocity conditions. Its greatest favUt, if any, lay in the opposite direction. While measuring extremely low velocities, the clicks were widely separated in time, and the hydrographer might have to wait several minutes before the first one oc- curred. Since many observations are needed during the course of a measurement, an unwarranted amount of his time would thereby be wasted. Such circumstances prevailed when John Hoyt returned to Washington, , in the fall of 1906 from Alaska, where he had just inaugurated the Territoi-y's first stream-gaging program. The events which then took place are best described in the following extract of a letter dated April 5, 1932, which Hoyt wrote to Willard G. Steward: As I remember, when I returned from Alaska in the fall of 1906, you were engaged in designing a penta head [one which produced a "
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