. Beck microscopes. Microscopes. Crescent Dissecting iiiii No. 3020. The design and construction of this instrument have been specially considered with a view to perfect rigidity. Many dissecting microscopes are made on the lines of an ordinary micro- scope stand, that is with a small base and pillar and a stage with the addition of hand rests. Such a construction is unsuitable for dissecting as the weight of the hands upon the hand rests has a tend- ency to upset the instrument. In the Crescent dissecting microscope the base is a heavy casting on three projecting feet and with tw
. Beck microscopes. Microscopes. Crescent Dissecting iiiii No. 3020. The design and construction of this instrument have been specially considered with a view to perfect rigidity. Many dissecting microscopes are made on the lines of an ordinary micro- scope stand, that is with a small base and pillar and a stage with the addition of hand rests. Such a construction is unsuitable for dissecting as the weight of the hands upon the hand rests has a tend- ency to upset the instrument. In the Crescent dissecting microscope the base is a heavy casting on three projecting feet and with two uprights to support the hand rests and stage. The sup- ports are directly under the hand rests, so that weight and pressure upon them have no tendency to tip the instrument. A pillar is provided at the back within which fits a solid rod which carries a swinging arm for the lenses. This rod is focussed up and down by a rack and pinion actuated by a milled head, which is placed at a convenient angle for the hand. The amount of motion is over 3 in. so that material of considerable thickness can be accommodated. The hand rests are of hard wood and the stage is a thick plate of glass. A mirror is provided below the stage, silvered on one side and opal glass on the other. The instrument is supplied with a single swinging arm for holding the lenses or with a double arm which gives greater latitude to the movement of the magnifier over the stage plate. No. 3020. Stand only £2 17 6 No. 3020A. Stand, with 2 single lenses X 5 and X 10 3 6 G No. 3020B. Stand, with 1 single lens x 5, and 2 achromatic lenses x 12 and x 20 5 16 No. 3020C. Stand with 3 achromatic lenses, x 5, x 12 and x 20 5 15 6 No. 3021. Double jointed arm fitted to any of the above ... No. 3022. Case for above 61 0 12 6 0 17 G. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfect
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Keywords: ., bookcontributorgerstei, bookleafnumber69, booksubjectmicroscopes
