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Decimal Scale
D. van den Bosch, 1821, measuring instrument, NG-MC-857
Polarising Filter
John Benjamin Dancer, c. 1880, measuring instrument, NG-MC-1409
Artificial Horizon
anonymous, anonymous, anonymous, c. 1830 - c. 1865, measuring instrument, NG-MC-1031
Decimal Scale
D. van den Bosch, 1821, measuring instrument, NG-MC-858