Publisher's Synopsis
Excerpt from Construction and Test of a Rotary Transformer for Direct Current: A Thesis
The introduction of Tantalum.filament lamps in 1906 gave a great impetus to the lamp industry. The Tantalum filament changes its physical structure during use, losing its smooth, uniform surface, and becoming rough, off set, and brittle. This change takes place more rapidly on alternating than on direct current circuits. About two years later, the lighting industry received another advance in the shape of the Tungsten filament lamp. This lamp at watts per candle power means a lamp over 200 times as good as a standard carbon lamp, each with normal life. Tungsten lamps of 6 to 20 volts have short, thick filaments and are very long lived and satisfactory. The low, specific resistance of the Tungsten gives the filament a very desirable dimensions, this advantage has caused a large increase in the use of low voltage lamps for many purposes, especially for residence lighting systems of from.27 to-60 volts. The low voltage lamps having a heavier filament for the same candle power, are more durable than the lighter filament of the standard voltage lamp. The longer life of this filamentis due to the greater diameter and shorter length.
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