. Beck microscopes. Microscopes. is required on a great variety of subjects, this instrument will function for transmitted light, dark ground illumination, metallurgical work or the examination of all opaque objects or the study of opaque ores with polarised light. W'ith a small prism over the vertical tube it can be used for microprojection. The vertical tube will also receive a camera lucida for drawing. BRIEF SPECIFICATION OF THE INSTRUMENT. Bodies. 1. Binocular, with adjustments for interocular distance. 2. Monocular body with graduated drawtube. 3. Monocular body with drawtube, combined w
. Beck microscopes. Microscopes. is required on a great variety of subjects, this instrument will function for transmitted light, dark ground illumination, metallurgical work or the examination of all opaque objects or the study of opaque ores with polarised light. W'ith a small prism over the vertical tube it can be used for microprojection. The vertical tube will also receive a camera lucida for drawing. BRIEF SPECIFICATION OF THE INSTRUMENT. Bodies. 1. Binocular, with adjustments for interocular distance. 2. Monocular body with graduated drawtube. 3. Monocular body with drawtube, combined with a vertical tube and detachable camera (j-plate 4^ in. x 3^ in.) with exposing shutter. The vertical tube is provided with a focussing adjustment to set the focus on the plate to correspond with the visual focus. With camera removed it can be used for drawing or projection. Fine adjustment actuated on both sides of the limb, provided with divided drum. Coarse adjustment, helical rack and pinion with clamp for tightening or fixing position. Stages. Five alternative forms :— 1. Plain stage with detachable mech- anical stage No. 3305 as illustrated on page 84. 2. Built-in mechanical stage in which the large square top plate is moved in both directions instead of the object being moved over the surface of the stage, enabling large objects or culture plates to be moved mechanically as readily as 3x1 slides. The front of this stage is cut away for the rapid interchange of the sub- stage apparatus, as illustration page 40. 3. Mechanical stage as above, but not cut away in front. 4. Mechanical stage No. 3515 as de- scribed on page 84 having horizontal travel of 3 inches and vertical travel of IJ inches (as illustrated). 5. Circular revolving stage with centring adjustments, plain, or with mechanical motions (No. 3306 page 84). Substages. Three alternative forms :— 1. Rack and pinion focussing with Ake- hurst slides for interchanging apparatus (as illustration). 2. Rack and pinio
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Keywords: ., bookcontributorgerstei, bookleafnumber49, booksubjectmicroscopes
