Variations in production per farm and per worker in Missouri, 1939

"In wartime, manpower is an item of scarcity and must be used as effectively as possible on farms as well as in factories and offices. Since the productivity of farm operators and workers varies widely from area to area within the United States and even within a particular state, it has become necessary to promote the shifting of workers and even farm operators from one area to another to make most efficient use of the manpower available for farm production. To assist those charged with the handling of Missouri farm labor problems in their determination of policies, information relative to differences in productivity of workers among the areas of the state is needed. Unfortunately, the latest data which may be used for these comparisons are those collected during the 1939 census. Although productivity has increased greatly since 1939, which makes the data presented appear out-of-date, it is expected that the relative position of counties and areas has not changed greatly. Thus, the material presented may be used to indicate the relative productivity of farm manpower within a county or area."--Pages 1-2

Using feed price information to reduce production costs

Caption title.Digitized 2006 AES MoU

Income, expenses and savings of local cooperative associations

Publication authorized March 12, 1945

Missouri farm prices since 1910

Publication authorized February 27, 1940

Farmer's cooperative marketing and purchasing associations in Missouri

Cover title.Includes bibliographical references

Seasonal variation and economy of basic feeds, 1924-1940

Cover title.Includes bibliographical references

Market organization and costs in the St. Louis wholesale fruit and vegetable market

Publication authorized March 11, 1941.Digitized 2007 AES.Includes bibliographical references

Amounts and cost of credit extended by cooperative exchanges

Cover title.Includes bibliographical references

Operating expenses of cooperative exchanges and elevators

Cover title.Includes bibliographical references

In-Situ Diagnostic for Assessing Hall Thruster Wear

The design of a new diagnostic to measure the net erosion of Hall thruster surfaces is presented. This diagnostic consists of a pair of optical non-contact profilometer pens mounted to a set of motion stages, which can interrogate the surface features of multiple components of interest including the hollow cathode assembly, magnet front pole covers, and discharge channel. By comparing scans of these surfaces to reference features, estimates of the component erosion rates can be acquired throughout long-duration lifetime tests without venting and removing the thruster from the vacuum facility for external profilometry. This work presents a detailed overview of the diagnostic design including the precision positioning system. In addition, preliminary data are shown which verify diagnostic operation and establish a baseline that will be used to track the erosion of the Hall Effect Rocket with Magnetic Shielding (HERMeS) Technology Demonstration Unit 3 (TDU-3) during an ongoing long-duration wear test