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​​​​H. R.  Scientific Works

PRIMARY COLOR APPARATUS

OPTICAL TANK

POLAROIDS BRASS IN VALVET BOX

PORTABLE TELESCOPE

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PRISM TABLE

OPTIC KIT SIMPLE

pin-point impression

OPTICAL BENCH DOUBLE ROD METAL

OBJECT NEEDLE

PERSISTENCE OF VISION

NEWTON COLOR DISC

PIN HOLE CAMERA WOODEN

ray box metal with slit and lens