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RADIO BROADCAST
143
is generally devoted to a testing table with outlets tapped to all wires running to the operating room. There is easy access to antenna and ground connections, A. C. and D. C. lines, and in the case of three wire systems both I ID and 220 volts are available. Wires are usuallx' led from the A and B batteries in the shack so that all working conditions can be duplicated in the shop and apparatus given practical tryouts before being permanently installed.
The tool equipment of the shop varies proportionally to the owner's pocketbook, and paradoxicall},' it is often an inverse proportion. It invariably includes the conventional carpenter's implements augmented by such drills, saws, etc., as facilitate working with bakelite, metal, and less ductile materials. An assortment of taps and dies is almost as essential as the soldering iron with its inevitable can of Nokorode. There, too, is the ubiquitous set of drawing instruments (the dividers gradually wearing away under the stress of man\' sharpenings) used in designing and la\ ing out panels. In the more pretentious laboratories are found the bench lathe and drill press, tending through speed and accuracy to greater efficiency.
The accompanying photo shows the operat
ing end of a radio laborator\' in New York, owned by Mr. Henry Muller. This station, 2BH, stands an eloquent testimonial to the advantage of the well-equipped shop. The transmitting apparatus, a bulb set shown to the left, was designed electrically by the author, and constructed with meticulous attention to detail by Mr. Muller. All holes, with the exception of those inaccessible to the press, were drilled by machine. The large openings for the meters were cut by a power scroll-saw. The brackets were cut, drilled, and bent from massive strip brass, while the bushings and some back-of-the-panel construction are evidence of excellent lathe work. The core for chokes and the filament heating transformer were snipped from sheet iron and wound with commercial accuracy on a lathe. The tuning and amplifying cabinets show the intelligent use of good tools.
Indispensable to the radio lab are the raw materials with the almost infinite list of odds and ends. The miscellany of bakelite, hard rubber, brass and copper strips, nuts, bolts (six and eight thirty-two's predominating), glass, mica, "cabbages and kings" are of inestimable value when arranged in any semblance to system.
Operating table of an up-to-date amateur station (Radio 2BH)