Recent Researches High Frequency Tesla Lamp Vacuum

The Tesla “No Electrode” Brush Bulb

Griffin BrockPost a Comment
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As of now, parts have been received for a diffusion vacuum pump which is capable of pulling a vacuum to 0.000000001 Torr (roughly the same pressure experienced in Low Earth Orbit, LEO). This will be the driving force behind all brush bulb research, and allow the determination of which vacua standards is applicable to Tesla’s design. A prototype design for the bulb has been constructed, with aim to understand which design criteria is necessary for achieving the rotating brush action.

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Shown above is the un-evacuated Brush Bulb, having elongated stems which will be shortened and sealed off after vacuum evacuation. The outside sphere measures three inches in diameter.

It is worthy to note the various Brush Bulb designs Tesla put forth between the year 1892 – 1919. Distinctions during this time vary with the inner sphere changing in diameter, to the different sealing methods of the thinner tube. As can be determined, there does not seem to be an overall difference in design throughout the years.

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Depicted above is the Brush Bulb as illustrated in 1892 from Tesla’s book “Experiments with Alternate Currents of High Potential and High Frequency”. Notice the difference in depiction of figure 15, as compared to figure 13. Despite their physical differences, they represent the same bulb.
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Taken from a segment written by Tesla in the 1919 issue of “The Electrical Experimenter,” shows the typical design of the Brush Bulb, image 2, and the developed brush effect in image 3. Although both images are describing the same bulb, image 3 appears very different in design. Most noticeably, the center sphere, S, is far smaller, and the neck, N, slightly thinner in diameter. It may be concluded that these differences are simply drawing inconsistencies, as Tesla does not specify any differences with respect to the image figures.

Concluding with these images, design of the Brush Bulb has only varied with the interpretation of the artist at the time of drawing. What must be taken into account while dealing with experimental design, is the required and optimum proportions of the tube, B, sphere, S, and the degree of vacuum exhaustion in the outer globe, L.

Griffin G. Brock

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