Excavation of 41FY58, Fayette County, Texas

The site 41FY58 was discovered on U.S. 71 in eastern Fayette County and reported in 1973 by the survey archaeologist of the Texas Highway Department. Surface indications were highly encouraging and the site was recommended for extensive investigation

Turbomolecular Pumps for Holding Gases in Open Containers

Proposed special-purpose turbomolecular pumps denoted turbotraps would be designed, along with mating open containers, to prevent the escape of relatively slowly (thermal) moving gas molecules from the containers while allowing atoms moving at much greater speeds to pass through. In the original intended applications, the containers would be electron-attachment cells, and the contained gases would be vapors of alkali metal atoms moving at thermal speeds that would be of the order of a fraction of 300 meters per second. These cells would be parts of apparatuses used to measure fluxes of neutral atoms incident at kinetic energies in the approximate range of 10 eV to 10 keV (corresponding to typical speeds of the order of 40,000 m/s and higher). The incident energetic neutral atoms would pass through the cells, wherein charge-exchange reactions with the alkali metal atoms would convert the neutral atoms to negative ions, which, in turn, could then be analyzed by use of conventional charged-particle optics

The Beech Line in Northwestern Indiana

An Indiana beech is without doubt one of the most sensitive indicators of decline in mesphytism in habitat. In the rugged areas of the state it marks the borders between moist northfacing slopes and more xeric south-facing slopes. This was shown by Potzger, Potzger and Friesner for the southern as well as for the eastern part of Indiana. Beech also records the effects which the increase of steepness of slope has on the usual more mesic conditions of north-facing slopes. This characteristic of the species suggested a study of the forests along the eastern periphery of our Indiana prairie area to see if the transition between mesophytic forest and prairie functioned as a progressive change or represented a sudden break between two vegetation types. The senior author is engaged in a study of the original vegetation of the state, using as basis the witness trees noted and recorded by the men who made the original U. S. land survey. The study of distribution of beech along the border of the prairie peninsula is one of several papers dealing with phases of the state-wide survey which seem to warrant more detailed consideration