J. Grunow, New York

Small microscope with spiral tube focusing

J. Grunow, New York. Small microscope with spiral tube focusingJ. Grunow, New York. Small microscope with spiral tube focusing
J. Grunow, New York. Small microscope with spiral tube focusing
tube

There is a grove cut into the surface of the inner tube. This meshes with a small protrusion inside the outer tube. As a consequence of this, the microscope focuses smoothly just by twisting the inner tube within the outer. The fine focus adjustment on this instrument is a knob located under the stage that tilts the spring loaded upper stage plate up and down.

The microscope is signed on the limb J. Grunow. New York, but is without a serial number. It dates from around 1880. The Grunow brothers, Julius and William, emigrated from Germany to New York around 1849. They started in the scientific instrument business by first working for the optician Benjamin Pike of that city. By 1854, they began their own operation in New Haven CT where they concentrated on the production of microscopes. By 1864, they were back in New York. Some years later, the partnership ended. J. Grunow continued on to produce microscopes up to around 1892. The total output of the Grunows was limited in comparison to some other contemporary firms; on the basis of the observed serial numbers, they manufactured just over one thousand microscopes in total.

A family history of the Grunows in 19th century America written by a descendant.

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