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Comprising two cast metal uprights linked by a pair of parallel plated metal support rods and supporting an expansion bar at the top. Supplied with expansion bars. Comprising two cast-iron uprights, height 18 cm linked by two nickel plated rods supporting on expansion bar, length 38 cm fixed to one upright and resting on a friction pointer placed at the other. Supplied with scale reading 0 to 90 deg. and one each of aluminium, brass and iron expansion bars.