Wilhelm Reich's Fluorophotometer, as described in Cancer Biopathy, (1948, pages 61-65).

Original apparatus manufactured by Pfaltz and Bauer, New York.
1. Mercury Arc Lamp 
2. Lens
3. Adjustable Iris
4. Optical Filter, isolating mercury lines in the vicinity of 3650 Angstroms (deep blue or near ultra-violet part of the spectrum).
5. Optical Slit, to focus light upon sample
6. Sample inside compartment, probably a test tube (as seen from above)
7. Optical Filter, isolating green or blue-green portions of the visible spectrum, around 4700 Angstroms
8. Photocell
9. Recording Galvanometer - the original apparatus projected a light-beam onto a scaled read-out, with a sensitivity of 2.1 x 10-9 amps per mm of deflection, and a resistance of 554 ohms.

Theory of operation: Light from the mercury arc lamp is isolated to ultra-violet portions of the spectrum (~3650Å), which then excites the sample to emit light at a different, longer wavelength, in the green part of the spectrum (~4700Å), which is measured at 90° off the beam path of the original light source.  The higher the sample's orgone charge, the greater the quantity of excited, emitted light, and the higher the reading.

Similar, but not identical apparatus are available on the market today, such as various chlorophyll fluorometers, one of which is sold by Opti-Sciences company. Other fluorophotometers, allowing selection of specific excitation frequencies and fluorescing frequencies, are also available, though we do not yet have specific information to post here as yet. We would welcome suggestions of similar apparatus on the market today, to add to this web page.

Copied from a chart on display at the Wilhelm Reich Museum, but not previously published.

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