Rotary Brush Research Articles

Stem Applications of Azodrin for Control of the Cotton Fleahopper12

Azodrin® (3-hydroxy-N-methyl-cis-crotonamide dimethyl phosphate) was applied in a series of experiments to the stems of cotton plants with a recently developed rotary brush applicator for control of the cotton fleahopper, Psallus seriatus (Reuter). Effective control was obtained for 2 weeks with rates of Azodrin as low as 0.25 1b per acre. Results also demonstrated the feasibility of largescale field applications of Azodrin to the stems of cotton plants.

Sancta Sophia, Trebizond—A Note on the Cleaning and Conservation Work

This Byzantine church was converted into a mosque in 1577, when the wall-paintings probably received a coat of whitewash. By the 19th century it was in a state of dilapidation, and in 1880 a general restoration was carried out, including removal of loose plaster and general replastering. Much of the wall-painting that remains is covered with chipmarks made to give a key to the new coat of plaster. To remove the 19th century plaster a sculptor's hammer and chisel were used. Removal of the underlying whitewash was mainly by palette knife and, finally, finely-headed dental drills. Other tools were a rotary wire brush mounted on an electric drill, and soft indiarubbers. To secure the original plaster and fill the chip marks a composite plaster of casein, lime, and marble dust was used, with a small amount of sodium pentachlorphenate as fungicide. Powdery paint was strengthened with polyvinyl alcohol. No attempt was made to do detailed restoration. Missing areas in the paintings were toned in such a way as not to be distracting to a visitor while revealing their presence to the scholar. The toning paint consisted of earth colours in bone glue.

Some Properties of Synthetic Detergents derived from Docosenols

Sodium docosenyl sulfates, ammonium docosenyl sulfates and sodium docosenyl sulfoethyl ethers were synthesized in pure states from Δ11, 12 docosenol and erucylalcohol respectively.Their properies of surface and interfacial tension, foaming, detergency and solubilities into water were tested. As the results, it was recognized that sulfates of C22 monoenic alcohol were practically useful as detergents.Also the newly made high vacuum apparatus having a rotary brush showed a good fractionation efficiency on the purification of the higher fatty alcohol acetates.

Accidental Isolation of Trichophyton Mentagrophytes from the Floor of a Schoolhouse

A proven case of cryptococcosis was seen in the Department of Dermatology, University of Michigan Hospital, and attempts were made to trace the possible source of infection. At the onset of his illness, the patient was working as a janitor in the Foster School of Ypsilanti, Michigan. This is a rambling, one-story schoolhouse built during the Second World War. In view of the recent reports of the isolation of Cryptococcus neoformans in nature (1, 4, 5), samples of soil and floor dust from the schoolhouse were obtained: Sample 1 and Sample 2 were soils from under drains, Sample 3 was from the sweepings gathered in the bag of a vacuum cleaner used to clean the floors, and Sample 4 was from dirt accumulated on a motor-driven rotary floor brush. Each sample was suspended in physiological saline solution in a 100 ml graduate with vigorous agitation and left to settle at room temperature. After 3 hours, portions of the top layers of the suspensions were inoculated on duplicate Sabouraud's-dextrose-agar slants, both with and without penicillin and streptomycin. One set of the cultures was left at room temperature and the duplicate set, at incubator temperature. These were examined periodically for growth and discarded after six weeks. For animal inoculation, one ml of the supernatant layer of each suspension was injected intraperitoneally into mice. Each suspension was used to inoculate five mice. Pieces of the livers, spleens and lungs of animals that died were planted on Sabouraud's dextrose agar slants. The remaining animals were sacrified after three weeks and the organs similarly planted. The cultures directly planted with the samples did not show any growth of pathogenic fungi, and most eventually became overgrown with contaminants. However, Trichophyton mentagrophytes was isolated from the livers or spleens of two animals inoculated with portions of Sample 3, composed of vacuum cleaner sweepings. The macroscopic and microscopic features of these isolates were characteristic (FIGS. 1,

Metal Spraying in the Radio Industry

IT is today the normal practice to protect all ferrous metal parts used in the manufacture of chassis, decks, cabinets, etc., for commercial radio work, with an applied spraying of non‐ferrous metal. The metals most commonly used are zinc and aluminium, although it is right to say that practically any metal, which can be drawn into a wire, can be sprayed for protection purposes. Zinc is perhaps the most generally used, on account of its relatively low cost. The sprayed metal reacts favourably to cleaning with wire brushes and an attractive matt finish is readily obtained without the trouble attendant on normal polishing. Hand or rotary brushes can be used with flexible shafts for small articles or large areas. The applied coating can be of various thicknesses, dependent upon the type of atmospheric conditions it is expected to encounter, such as industrial pollution, salt‐laden sea air and spray, and tropical or highly humid atmospheres. The thickness is measured by a direct‐reading contact meter and 0.003 to 0.010 in. depth of metal applied is quite adequate protection for 12 to 15 years.

Rotary Brush Units for Aerial Spraying Against Mosquitoes and Black Flies1

Rotary Brush Units for Aerial Spraying Against Mosquitoes and Black Flies1

No magic formulas

During this vacation period in the late summer of 1944, the janitors of the Western Kentucky State Teachers College are hard at work removing from the floors of halls and classrooms the black marks left by heavy-soled G. I. shoes. The wearers of the shoes were some 1,600 aviation students, members of the 321st College Training Detachment of the Army Air Forces, stationed on the Western campus from April 3, 1943, until June 30, 1944. There must be several thousand college janitors-and administrators-in the United States who would be glad to know it if our janitors have discovered a quick, easy way to remove those marks. I am sorry to report that they haven't. They tell me that several trips over the floor with a heavy, electrically-powered rotary brush and strong cleansing powder, then several more with vigorously administered floor mops and clear water, and then a few hours of concentrated attention on individual spots of an especially stubborn disposition leave the floor in only a reasonably good condition for rewaxing. The Army left behind no magic formula for the rehabilitation of floors.