. Bulletin - United States National Museum. Science. «^:%. ciinent meters, are interchangeable with the modern models. Except for a short time when the tailpiece was screwed into the early 617 yokes, any tailpiece will fit any yoke. Covert yokes can be substituted for any 621 or 624 yokes. So, whenever it became necessary to replace a part on a meter, it usually was replaced by its most modern counterpart. As a consequence, meters which had begun their existence as 617 models frequently became either partly or completely converted to 623 or 624 models. This practice has continued, enabling the
. Bulletin - United States National Museum. Science. «^:%. ciinent meters, are interchangeable with the modern models. Except for a short time when the tailpiece was screwed into the early 617 yokes, any tailpiece will fit any yoke. Covert yokes can be substituted for any 621 or 624 yokes. So, whenever it became necessary to replace a part on a meter, it usually was replaced by its most modern counterpart. As a consequence, meters which had begun their existence as 617 models frequently became either partly or completely converted to 623 or 624 models. This practice has continued, enabling the Geological Survey to keep its thousands of meters up to modern standards and in good repair at minimum cost. With the introduction of the Covert yoke, both the Geological Survey, as represented by J. C. Hoyt, and the firm of VV. & L. E. Gurley seemed satisfied with the meter's design, and no further changes were made for several years. W. G. Price's Final Design In the summer of 1920, \V. G. Price, then in Yakima, Washington, examined the changes that had been made in his current meters and was displeased. The change that most irritated him was that which had been made in the upper bearing of the Small Price meter. In every talk or article he had pre- sented on the subject, he had emphasized the im- portance of both bearings operating in air pockets which would exclude water, silt, and grit. Despite his admonitions, the design adopted for the upper bearings on all the Small Price meters thus far manu- factured was identical to that which he had con- demned on the Ellis meters as far back as 1882. His first step toward combating that condition w-as to apply on August 19, 1920, for a new patent which had for its objective "the effective protection of the bear- ings from contact with water, dirt, or other foreign ; Patent 1,413,355 was granted him on April 18, 1922. During the almost two years while he w^as waiting for the application to be processe
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