Publisher's Synopsis
Excerpt from Comparison of the Characteristic Curves of Tungsten Lamps
The First of these to appear on the market was the metallized carbon filament lamp. This lamp has an efficiency of about watts per candle power. A marked improvement over the old carbon filament. This lamp was soon Followed by the metallic tantalum lamp which has an efficiency of watts per candle power. The lamp. Although having a much higher efficiency than the carbon lamp. Has a slightly shorter life and must be handled with greater care. The tantalum filament is very Fine and hence easily bro - ken. But has the advantage that it is sometimes possible to Fuse it'together gain by Simply Shaking the bulb. The circui1 being on.
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