Hard crown glass, refractive index 1.519 to 1.523 25 x 25 mm 32 x 32 mm 38 x 38 mm
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Δ
Wooden block 50 x 50 x 50 mm with slot to take rectangular mirrors.
Rectangular, clear, all sides polished
90 mm diameter,16 mm thickness
Brass dial head 40 mm diameter divided and marked in 100 divisions, vertical scale 10-0-10 mm, fitted on heavy brass disc, with 3 pointed legs, distance between legs 40 mm.
Free from air bubbles, all sides polished
Metal holder with sides grooved to hold lens up to 50 mm diameter on wooden support.
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