ricted on account of the tube of the microscope, remove the drawtube. When all is in readiness it is well to wait for three to fiveminutes and then to see if the image is still sharply focused. If it hasgot out of focus simply by standing, a sharp picture could not be ob-tained. If it does not… … Fig. 156. lens holder composed of several links and balls, thus giving the flexi-bility of a chain and enabling one to turn the lens in any desired direction. Eachlink has a screw to take up -wear, thus insuring pertnanence. The lens is graspedby two movable pieces -which open -widely enough to…
Microscopy
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