. A new thermo-electric fluid-meter and hot-wire anemometer. such as the hot ^-jxreanemometer. It hao also been used for the re-clamation of short pieces of wires of various kinds,such as aluminum, platinum, spring steel, etc. The electro-percussive method i!5 siiitablefor mary ap-plications in the .iewelry trade, such asthe .ioining of platinum without showing any solderline; the welding of sterling tips to table forkswithout annealing; the welding of pins to badges,and many other similar applications. The attachmentof contact points of platinum, tungsten, silver, etc.,for various electrical
. A new thermo-electric fluid-meter and hot-wire anemometer. such as the hot ^-jxreanemometer. It hao also been used for the re-clamation of short pieces of wires of various kinds,such as aluminum, platinum, spring steel, etc. The electro-percussive method i!5 siiitablefor mary ap-plications in the .iewelry trade, such asthe .ioining of platinum without showing any solderline; the welding of sterling tips to table forkswithout annealing; the welding of pins to badges,and many other similar applications. The attachmentof contact points of platinum, tungsten, silver, etc.,for various electrical purposes is also very readilyaccomplished. It is the authors opinion that the electro-percussive method of welding will eventually open upa wide field of welding hitherto impossible. It alsooverlaps, to a certain extent, some of the presentmethods, but it will probably never supersede the exist-ing methods for the welding of very large sections. For very small wires and special arrangementssuch as those used in the Thermoelectric Fluid Meter, 260 FIGURE C. Resistance-Box, Condenser, and Do-uble-Gontact Key-Used in Welding Thermocouple Wires. ))c*^c*** ***>};:};*****+***>(;**** :*:*:»:**** 261 the author has, after considerable experimentingfound the arrangement shown in figure to givethe most consistent results. In welding wires of manganin and advancelarger than a No, 40 B. & s. the double contact keywas used so that sufficient pressure could be appliedat the point of contact in order to obtain a strongand permanent weld. For the welding of wires of No, 40B. & S. Gauge and finer this method was departed from,and the wires alone were used. In this case theterminals of the condenser were connected directly totne wires to be welded, and with the condenser under-going a charge, the ty/o wires v/ere separated one oftwo remaining stationary, while the other was in aposition to spring against the stationary wire im-mediately upon release and thus discharge the con-denser, l/Vh
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Keywords: ., bookcentury1900, bookdecade1920, bookidnewthermoele, bookyear1920
