The Fifteen Watt Tungsten Lamp

Chapter 12: TRANSCRIBER’S NOTE

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About This Book

A technical thesis investigates performance and behavior of a 15-watt tungsten electric lamp, presenting test methods, measurement apparatus, and empirical characteristic curves that relate candle power to voltage, current, resistance, and wattage. It reports life tests comparing constant-voltage, vibration-free conditions with severe mechanical shock, analyzes mean spherical candle power using Kennelley’s graphical method, and examines the overshooting phenomenon with proposed theories, quantitative measurements, and curve plots. Experimental limitations and sample-size caveats are acknowledged, and final conclusions synthesize the lamp’s efficiency, distribution patterns, and anomalous behaviors observed during testing.

TRANSCRIBER’S NOTE

Fractions are represented horizontally using the slash / symbol. The original separated the numerator and denominator horizontally, separated by a _ line.

Punctuation has been normalized. Except in the following cases, variations in hyphenation, spelling and spacing have been retained as they were in the original publication.

Chapter 2:

Lumer-Brodhum photometer —> Lummer-Brodhun photometer

Chapter 4:

What appear to be hand-drawn primes in the text have been confirmed as: The arc ha´ce —> The arc ha´c´e´.

e c a a´ c e´ —> e c a a´ c´ e´

Figure IV

There are two points b radiating from point O. The lower is likely to represent b´.

Chapter 5:

inportant difference between —> important difference between