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Surface plate; very smooth surface produced by lapping

Surface plate; very smooth surface produced by lapping

1919

Two Whitworth surface plates 6" x 4" in box

Two Whitworth surface plates 6" x 4" in box

1850-1892

Surface plate, steel instrument from drawing office with 2 circular scales attached. In velvet lined case. 12"x2"x1 1/2"

Steel surface plate

Surface plate for use with a monocromatic light unit.

Surface plate for monocromatic light unit

1959