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INSTRUMENTATION
complete process instrumentation
F&P improved glass pipe coupling
F & P IMPROVED GLASS PIPE COUPLING ELIMINATES BOLTS AND NUTS Greatly simplifies glass-to-metal and glass-toglass connections in glass pipe installations.
F&P has developed a new coupling which provides maximum flexibility of glass pipe installations. The ease of assembly and disassembly is the unique feature of this new method of achieving a positive pressure seal without the use of tools. Leakage and gasketing problems are eliminated by the perfect alignment and even take-up assured by this improved coupling. Naturally, the time required to change or install glass pipe sections is greatly reduced. Features of the F&P coupling are:
age or spillage, as pressure in the line cannot force the plug from the barrel of the stopcock. This stopcock will with stand greater pressure than the pipe itself. In addition to these unique glass prod ucts, F&P carries a complete stock of various elbows, tees and other standard fittings as well as straight lengths of glass pipe. Special fittings can be supplied to customers specifications. For further information send for our catalog
• Mo bolts, nuts, or flanges • Simplicity of installation and maintenance • Perfect alignment is assured Φ No tools required- can be fitted by hand 2 types available—glass-to-metal and glassto-glass . Sizes fo fit: V,
, Vz", %", 1" pipes
Another valuable contribution to the practical application of glass pipe lines is the F&P high pressure precision-ground stopcock. The valve design prevents leak-
FISCHER & PORTER COMPANY COUNTY LINE ROAD · HATBORO 2 2 , PA.
F&P high pressure stopcock Measuring, recording and controlling instruments Centralized control systems Data reduction and automation systems Chlorination equipment Industrial glass products
Sales offices in 32 American cities and in principal cities abroad For further information, circle number 58 A on Readers' Service Card, page 61 A 58 A
Running noise would be a negligible factor, especially in fractional horse power ratings. Vacuum tube regulated generators have been in limited use since World War I. As a matter of fact, some of the flying "box-kites" of that era were equipped with a wind-driven generator mounted on a strut. In one design, a two-bladed propeller drove a generator mounted in a streamlined housing. The tail section of the housing contained a tungsten filament diode. The filament current and anode voltage were supplied by the generator and the current through the diode was used to control field excitation in the generator. Since the anode current increases exponentially with filament temperature, the output of the tube is extremely sensitive to generator speed. This arrangement maintained the generator output voltage at 115 volts with variations of no more than a volt at propeller speeds between 1000 and 15,000 r.p.m. For many years 400-cycle a.c. has been used in aircraft power plants be cause very considerable weight saving can be effected in using transformers, chokes, etc., designed for this higher frequency. For obvious reasons, en gineering laboratories in the aviation industry are wired and supplied for this frequency as well as the conventional 60 cycles. Inasmuch as a great variety of electrical and electronic equipment is available for operation at 400 cycles, more frequent installation of 400-cycle supply would seem to be advisable in research laboratories. Although our discussion has referred primarily to d.c. and rectification problems, the inter polation is not entirely pointless because filtering out residual ripple is also much easier and economical at the higher fre quency. The chemist is an important customer as far as electrical energy is concerned. He need not look on helplessly while electrical engineers ponder the future of power generation. After all, he is largely responsible for the dry cell, the storage battery, and the international standard of e.m.f.—the Weston cell. He may have many direct contributions to make in the future as logical improve ments upon the labors of Volta, Daniell, Faraday, and Edison. ANALYTICAL
CHEMISTRY
