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6 caps to control light from condensers in box with collar

1831-1870

Concave substage mirror, 19th century

1801-1900

Concave lens in mounting, English, 19th century

1801-1900

Recessed ring with sliding collar

1851-1900
Double nosepiece for R.M.S. thread, by Swift, English, 1850-1900

Double nosepiece for R.M.S. thread

1851-1900