. Bulletin - United States National Museum. Science. INVENTOR /^^^. Figure 31.—Price's no. 1,571,433, showing both the single- and penta-contact facihties provided within one contact chamber. Note the upper bear- ing at the extreme top of the chainber. improving water-stage recorders. Five patents were awarded to him for such improvements. In 1925, Au turned his attention toward improving current meters, and hy October of that year he had apphed for a patent on a design which satisfied him. Two patents were eventually awarded: patent 1,644,005 dated October 4, 1927, and patent 1,704,16
. Bulletin - United States National Museum. Science. INVENTOR /^^^. Figure 31.—Price's no. 1,571,433, showing both the single- and penta-contact facihties provided within one contact chamber. Note the upper bear- ing at the extreme top of the chainber. improving water-stage recorders. Five patents were awarded to him for such improvements. In 1925, Au turned his attention toward improving current meters, and hy October of that year he had apphed for a patent on a design which satisfied him. Two patents were eventually awarded: patent 1,644,005 dated October 4, 1927, and patent 1,704,162 dated March 5, 1929. It was during the same year in which Au had applied for these patents that he and J. C. Hoyt appealed to the W. & L. E. Gurley firm to revise the design of the Small Price meters to cor- respond with Au's latest ideas. As usual, Gurley C. H AU CURRENT METER Original Filed Oct 17. 1925 1,704,162. Figure 32.—.Au's lor patent 1,704,162 showing the single- and penta-contact facilities both within the same chamber. Price's patent (fig. 31) appears to have covered this identical feature. agreed. They assigned catalog no. 622 to the new model and manufactured a small lot for field trial. The new models were referred to in Hoyt's writings as the "Small Price 'Improved' Current ; One of All's patent drawings of this meter is shown in figure 32. It reveals that his design still contained the feature that Price had objected to so strongly, namely that the upper bearing was located below x-a.\\\tx than above a substantial air pocket. Moreover, Au's new design for the lower bearing eliminated practi- cally all of the beneficial air pocket in that area. In fact, the improvements which Price had so diligently worked for in current meter design were seemingly ignored in Au's design. Apparently neither Au, nor Hoyt, nor Gurley's design engineers were aware of that circumstance. The first lot of experimental models built in accord- ance wit
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