No coin nor oath required. For personal study only.
June, 195o.]
CURRENT TOelCS 517 sensitive to the wavelengths of light given off by ordinary incandescent light bulbs, and is well suited to operate with these easily available sources with good fidelity. Another virtue is the device's low impedance.
Rollosprayer.--Chemical control of weeds in turf has been greatly facilitated by the invention of the Rollosprayer. Invented by Walter S. Lapp, of Lansdale, Pa., the Rollosprayer was originally designed to spray weedkillers on lawns and other turfed areas. It has also been found to be useful in applying insecticides, fungicides and soluble fertilizers on lawns, estates, golf greens, bowling greens, parks, athletic fields and cemeteries. Industrially it is suitable for spraying dust-laying solutions, sanitizing agents and clear water to the floors of factories, shops, warehouses, stores and schools.
The machine is simple in construction. The traction of the wheels supplies power to a small impeller pump which creates sufficient pressure to produce a flat fan-shaped spray 5 ft. wide as the machine is pushed along. The Rollosprayer is especially adapted for areas too large for a hand sprayer and too small for a power sprayer. It is in general comparable to the hand lawnmower in range of usefulness.
๐ SIMILAR VOLUMES
An evaluation of a miniature combined heat and power (CHP) system for generation of electricity and hot water for buildings has been carried out. The system utilizes solar heat pipe collectors to convert an evacuated liquid into gas under pressure. The pressure is used to drive a engine and thereby
AND m A T COSTS IN CHEMICAL WORKS. . 203 r a u i t s 80 far obtnincd wcro considered sufficiently suggcstivc t o wnrrnnt publicntion b thcniselvcs. Tho results of thcso vulcnnising tcsts wilf bo publislicd ns soon as nvniinblc. S icncc, L q n result of microscopio osnniinntion of Pnrn rubfjcr, ntt