{"product_id":"comparative-tests-of-carbon-metallized-carbon-and-tantalum-filament-lamps-classic-reprint","title":"Comparative Tests of Carbon, Metallized Carbon and Tantalum Filament Lamps (Classic Reprint)","description":"Excerpt from Comparative Tests of Carbon, Metallized Carbon and Tantalum Filament Lamps \u003cp\u003e\u003c\/p\u003eThe lamps chosen for the tests were selected from a lot of 100 of each type of lamp. These were bought directly from the manufacturer, a well known and reliable incandescent lamp com pany. \u003cp\u003e\u003c\/p\u003eRatings - The carbon lamp was rated by the manufacturer at 25 candle power at 110 volts with an efficiency of watts per candle. The metallized filament lamps were rated at 50 watts at 110 volts, no mention being made of candle power on label. The tantalum lamps had a rating of 22 candle power at 110 volts. \u003cp\u003e\u003c\/p\u003eFilaments - The filaments of the carbon lamp were of the fa miliar single-loop type anchored in the middle of the loop. They had a smooth uniform appearance and were of the steel-gray color common to all properly flashed carbon filaments. The filaments of the metallized lamp were not so smooth in appearance as those of the carbon lamp. They had a kinked appearance, which, ao cording to the statement of the manufacturer, was due to the meth od of treating the filament and in no way affected the efficiency of the lamp. The color was steel gray, Slightly darker than the car bon filament. The filaments were double, consisting of two horse shoe loops, the inside ends oi which were attached to a common anchor. The tantalum filaments were very fine and long, as was necessitated by the rather low specific resistance of the metal tan talum. They were mounted in the well known zigzag fashion upon supporting spires. The color was a silver-gray with a metallic luster. Fig. 1 is a photograph of the three types of lamps used in the tests. Table 1 gives the approximate effective dimensions of the three types of filaments. \u003cp\u003e\u003c\/p\u003eAbout the Publisher \u003cp\u003e\u003c\/p\u003eForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com \u003cp\u003e\u003c\/p\u003eThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.","brand":"None","offers":[{"title":"Paperback","offer_id":46620337438930,"sku":"9781334346743","price":9.57,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0655\/8980\/5233\/files\/1_e163331b-66d6-44f2-b369-23adfc3b3862.jpg?v=1762662861","url":"https:\/\/www.indigo.ca\/products\/comparative-tests-of-carbon-metallized-carbon-and-tantalum-filament-lamps-classic-reprint","provider":"Indigo","version":"1.0","type":"link"}