With a Grease Spot Photometer or Bunsen Photometer /German Fettfleck Fotometer) you can compare two electrical powers of any alternating and direct currents of any waveform and frequencies up to the GHz range.
To do this, I place oil-soaked paper in the middle between two identical light bulbs, through which the currents to be compared flow.
Rear lamp more power than front lamp:
Front lamp more powerful than rear lamp:
Grease Spot Photometer
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Wolfgang
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Grease Spot Photometer
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Wolfgang
- Posts: 338
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Re: Grease Spot Photometer
Same power:
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