The Fifteen Watt Tungsten Lamp

Chapter 11: IX. CONCLUSIONS.

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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.

IX. CONCLUSIONS.

The following conclusions may be drawn from the results of the tests.

1st, That the quality of the two sets of lamps was greatly different.

2d, That it is doubtful if the 15 watt, 115 volt, tungsten lamp as first put upon the market met the guarantee as to life. This conclusion is reached by tests in the laboratory and experience with lamps installed in residences.

3d, That the tungsten lamp is subject to overshooting.

4th, That during this period the initial candle power may be as much as 50% above the normal.

5th, That the most probable theory of overshooting is the lag of resistance behind the temperature.