. Bulletin - United States National Museum. Science. Figure 20.—Original Small Price current meter designed by Edwin Geary Paul and constructed by \V. & L. E. Gurley; now in the Smithsonian's Museum of History and Technology. (USNM cat. no. 289643; Smithsonian photo 44538-E.) carrying two meters, one for wading measuremems and the other for cable measurements, was accepted as a necessary evil. That circumstance was demon- strated by the decision to manufacture a new model (no. 618) exclusively for wading measurements as a companion to model no. 617 for cable measurements. The new model no.
. Bulletin - United States National Museum. Science. Figure 20.—Original Small Price current meter designed by Edwin Geary Paul and constructed by \V. & L. E. Gurley; now in the Smithsonian's Museum of History and Technology. (USNM cat. no. 289643; Smithsonian photo 44538-E.) carrying two meters, one for wading measuremems and the other for cable measurements, was accepted as a necessary evil. That circumstance was demon- strated by the decision to manufacture a new model (no. 618) exclusively for wading measurements as a companion to model no. 617 for cable measurements. The new model no. 618 had no tailpiece. In its earliest version (fig. 24) it was suspended by means of a wading rod screwed into the top of the contact chamber, in the place normally occupied by the contact-chamber cap. In a later version (fig. 25) the wading rods were screwed into a boss on the yoke. In both instances the electrical contact facilities were identical to those furnished in the 617 models. Small Price "Combination Type" Current Meters With the advent of the model nos. 617 and 618 Small Price current meters, the Geological Survey assumed practically all responsibility for any changes in the design of such meters. This was not strange or arbi- trary because the Survey had become a world pioneer in conducting stream gaging on a systematic basis, and such an organization inevitably must take charge of the improvement of its own working tools. In any event, that was the prevailing attitude when John Clayton Hoyt of the Survey began to make his influ- ence felt on the improvement of current meters and their accessories. Although Hoyt was not noted for possessing any particularly outstanding mechanical ability, he was quick to recognize and to act on good ideas when he saw or heard of 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 perf
Size: 1987px × 1257px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
