Original RLI Figures

These are original scan-derived crops from Charles Proteus Steinmetz’s Radiation, Light and Illumination. They are promoted visual assets, not final annotated interpretations. Each crop has a JSON manifest and checksum in diagrams/original/radiation-light-and-illumination/figures/.

Promoted Crops

Spectrum of radiation table

Printed page 17. Places alternating-current fields, wireless waves, Hertzian waves, ultra-red rays, visible light, ultra-violet rays, X-rays, and sound waves into one frequency and wavelength table.

Fig. 14: Spectrum of radiation

Printed page 18. The graphical continuation of the table, used as a map across electric waves, light, ultra-violet radiation, and X-rays.

Fig. 15: Refraction wavefront geometry

Printed page 22. Shows Steinmetz’s geometric derivation of refraction through a change in speed across two media.

Fig. 18: Regular reflection

Printed page 28. Uses ray geometry and a virtual image to distinguish regular reflection from irregular reflection.

Fig. 19: Irregular reflection

Printed page 29. Shows scattered reflection in many directions, supporting Steinmetz’s discussion of bodies and radiation.

Why These Matter

The table and Fig. 14 are the first visual spine of the archive: they show Steinmetz placing electric waves and light in the same radiation continuum. Fig. 15 is a mathematical-visual bridge because the diagram is not decorative; it carries the derivation of the sine law of refraction. Figs. 18 and 19 show how Steinmetz moves between physical explanation and geometry when describing how bodies reflect radiation.

Manifest Paths

Asset	Manifest	Review State
Spectrum table	diagrams/original/radiation-light-and-illumination/figures/table-spectrum-of-radiation.png.json	Promoted scan crop; needs second-pass bibliographic verification.
Fig. 14	diagrams/original/radiation-light-and-illumination/figures/fig-14-spectrum-of-radiation.png.json	Candidate scan crop.
Fig. 15	diagrams/original/radiation-light-and-illumination/figures/fig-15-refraction-wavefront.png.json	Promoted scan crop; needs second-pass bibliographic verification.
Fig. 18	diagrams/original/radiation-light-and-illumination/figures/fig-18-regular-reflection.png.json	Promoted scan crop; needs second-pass bibliographic verification.
Fig. 19	diagrams/original/radiation-light-and-illumination/figures/fig-19-irregular-reflection.png.json	Promoted scan crop; needs second-pass bibliographic verification.

Next Visual Work

The next pass should extract diagrams from Steinmetz’s alternating-current and transient books: impedance geometry, hysteresis curves, transformer diagrams, oscillatory discharge curves, surge propagation, and distributed-constant line diagrams.