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Zeiss Compound Microscope Delivery Book 1857-1881

Column four of the Delivery Book details the Objectives and Eyepieces included with the specified stand.
It is useful to know what the references mean as they generally comprise a series of letter and numbers.
The letters refer to objectives and the number to eyepieces.
The pages below are extracted from an 1889 catalogue and depict tables of objectives, eyepieces and magnifications.