Grease Spot Photometer

[Wolfgang]

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:

1_fett1.JPG (6.41 KiB) Viewed 48 times

Front lamp more powerful than rear lamp:

1_fett2.JPG (5.94 KiB) Viewed 48 times

[Wolfgang]

Same power:

1_fett3.JPG (6.61 KiB) Viewed 45 times