By critical angle method, A metal bridge fitted with air cell holder, knob and graduated circular scale, with one air cell, 50 x 50 mm size
1. Apparatus Without Tank
2. Transparent Tank for Apparatus.
3. Size 70 x 70 x 70 mm
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.
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