Scientific Instruments > Scientific Optical

19th Century Martin Type Drum Microscope by Crichton, London.

Item#: SOI1055

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19th Century Martin Type Drum Microscope by Crichton, London. - click to enlarge.19th Century Martin Type Drum Microscope by Crichton, London. - click to enlarge.

An Early 19th Century Martin Type Drum Microscope by Crichton, London. This is the finest example of Martin type drum microscope developed in the early 19th century, prior to focusing with rack and pinion knob. Made of lacquered brass and signed by Crichton, 112 Leadnhall Street, London. The ocular eyepiece and objective lenses are fixed to the main body-tube. Focusing is achieved by adjusting the tube height. The specimen slide is held tight under the circular stage with a spring. A concave mirror concentrates the light for transparent specimens and a magnifying lens concentrate the light for opaque objects. Comes with rotating spring forceps to hold insects or crystals, brass tweezers and demonstration slide.