Radio Broadcast - 1927, May - 61 Pages, 4.9 MB ... - VacuumTubeEra

RADIO BROADCAST ADVERTISERALUMINUMBOX SHIELDSMade of "Alcoa Aluminum'Consist of:Top, Bottom, Sides4 Extruded Corner Posts8 Aluminum ScrewsEETING the highest radio standards shipped toyou in the most convenient knocked-down formfor easy assembly These Box Shields are madeof heavy aluminum (.080" No. 12 B. & S.) and are supplied5"x9" x6", which will cover most requirements. Ifthe size does not meet your exact needs, change it Aluminumis easy to work.CT'HE ordinary typeof low resistance volt'J. meter cannot be used to measure the out'put of battery eliminators because mosteliminators cannot deliver sufficient cur'rent to operate the voltmeter and stillmaintain their voltage. For this serviceWeston now offers a special voltmeterwith an exceptionally high self-con'tained resistance of 1,000 ohms pervolt Model 489 Battery EliminatorVoltmeter. This new instrument,because of its high resistance, re'quires a current of only one milli'ampere to produce full scale de'flection. It is made in twodouble range combinations of200/8 and 250/50 volts. Thelatter range can be suppliedwith an external multiplierto increase it to 500 volts.Ask your dealer or ad'dressManufacturers can obtain these shields made to their exactspecifications or they can secure the necessary corner-postmoulding and sheet to manufacture under their own supervision.Those who use Aluminum have ample proof of its advantages.Insist on "Alcoa Aluminum," ask your dealer orwrite us."ALCOA ALUMINUM" is furnished to manufacturersin the following forms:ALUMINUM INSheet: for shields, chassis, variable condensers,cabinets.Panels finished in walnut and mahogany.Die and Sand Castings.Screw Machine Products.Foil for fixed condensers.High Purity Rods for rectifiers.Stamping, rod, wire, rivets.EVERY COMMERCIAL FORMALUMINUM COMPANY of AMERICA2320 OLIVER BUILDING, PITTSBURGH, PA.ALUMINUM ItWESTON ELECTRICALINSTRUMENT CORPORATION179 Weston Avenue, Newark, N. J.STANDARD THE WORLD OVERWESTONPioneers since 1888