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Unspecified / early 20th century

Microscope

Microscope

The Smithsonian catalogs Microscope as microscope accessory in its Science & Scientific Instruments records.

WHY IT’S INTERESTING

Compound monocular microscope designed for use with the Brinell Ball Test for determining the hardness of a piece of metal. Here, a small ball is pressed into a sample, and the resulting indentation is examined with a Brinell microscope. Johan August Brinell, a Swedish engineer, proposed the test in 1900. The results are given in BHN (Brinell hardness numbers).

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A CLOSER LOOK

The Smithsonian lists the object under Science & Scientific Instruments and dates it early 20th century.

Compound monocular microscope designed for use with the Brinell Ball Test for determining the hardness of a piece of metal. Here, a small ball is pressed into a sample, and the resulting indentation is examined with a Brinell microscope. Johan August Brinell, a Swedish engineer, proposed the test in 1900. The results are given in BHN (Brinell hardness numbers).

FOLLOW THE EVIDENCE

Smithsonian InstitutionMicroscope

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