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Bulloch – "Biological" model brass microscope

In 1873, Walter Bulloch introduced the separate swinging substage tailpieces – one with the condenser, the other with the mirror. This popular American design -- similar to that of Zentmayer in Philadelphia -- caught on and spread to England. It allowed very oblique control of the light falling on the slide. The exaggerated swing range of the tail piece necessitated making the stage very thin to make room for the contorted angle of the condenser. This model, the "Biological", was introduced in 1879. It is signed "Patd. 1879, W. H. Bulloch, Chicago, Ill." on the base. A serial number of 186 is stamped into the underside of the base. The microscope stands about 12 " high when closed. It is one of the smaller of the Bulloch models.   The rotating circular stage is 3 " in diameter. It does not have its slide holder.  The microscope has rack and pinion coarse focus. Fine focus is via a knob on top of the limb. The finish is lacquered brass.  The instrument retains some of its original lacquer on the pillar and sides.  The lacquer is missing on the main tube, on the base, and around the rackwork.  The overall finish is a pleasing aged patina.  The plano-concave mirror can swing in an arc that takes it above the stage for side illumination. The plane side is excellent; the concave side shows age spotting but is usable.  As mentioned, the mirror and condenser can swing independently (see photos). Bulloch was not known to make his own lenses. The single lens here is a 1" by R & J Beck. The eyepiece is unmarked and has a field lens within the main tube. The microscope compacts to fit in its own dark wooden case with brass carry handle that is 12" high, by 7 "wide, and 8 " deep, and has an accessory drawer inside.  The case is in good usable condition.  Bulloch, along with Zentmayer, produced some of America’s most unique and sophisticated instruments.  They are much sought after by American collectors.

Item 1081

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