Journal . Fig. 3. I Z 3 4 Filament Flow on Tests (see p. 51). entirely, when acting in opposition, or increase the flow manyfold when a positive potential is impressed upon it. (Fig. 2.) The sizes and disposition of all the elements in a valve areworked out with the greatest degree of accuracy, the satisfactoryoperation in service depends upon accurate manufacture, sothat the problem is quantity production of exactly similarapparatus within very narrow limits. Further the fact mustbe borne in mind that the majority of the faults liable to creepinto such manufacture can only
Journal . Fig. 3. I Z 3 4 Filament Flow on Tests (see p. 51). entirely, when acting in opposition, or increase the flow manyfold when a positive potential is impressed upon it. (Fig. 2.) The sizes and disposition of all the elements in a valve areworked out with the greatest degree of accuracy, the satisfactoryoperation in service depends upon accurate manufacture, sothat the problem is quantity production of exactly similarapparatus within very narrow limits. Further the fact mustbe borne in mind that the majority of the faults liable to creepinto such manufacture can only be detected when the articleis practically completed and the electrical tests are this time, if a fault has developed in a jig or a process, pro-bably a great number of pieces are on the way having the samefault. SOME MODERN ENGINEERING PRACTICE IN AMERICA. 41 t40. 10 30 4C 50 Plate Voltage. Fig. 4.—Emission of Electrons (see p. 52).The author was largely instrumental in bringing into opera-tion a method of manufacture of this very delicate piece ofelectrical apparatus on which a start was made in May, work was carried out on the Pacific coast, 3,000 miles awayfrom the source of supply of the essential raw materials. Theavailable skilled staff comprised one mechanic, one glass blower,one pump operator. In addition, was a highly skilled radiooperator, but the rest of the employees had to be picked upfrom all sorts of occupations; the majority of them were taughttheir respective duties by the author. All of them were womenand girls, including the testing staff, and they showed remarkableadaptability to this new and in some cases difficult work. Everyvalve made was tested and a large number of curves was made,some of which accompany this paper. At the time of maximum 42 SOME MODERN ENGINEERING PRACTICE IN AMERICA. output about 70 hands w
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