. Beck microscopes. Microscopes. the lenses at one end. Each object glass is so threaded that it can be placed in the microscope body in two ways, one way having the tubular mount projecting out of the body and the other with the tubular mount inside the body. By this means the distance between object glass and eyepiece is made to differ very considerably and widely different powers are therefore obtained. The optical performance is not interfered with as the object glass by this process is reversed By the use of two pairs of eyepieces, also of different powers, four powers are therefore obtai
. Beck microscopes. Microscopes. the lenses at one end. Each object glass is so threaded that it can be placed in the microscope body in two ways, one way having the tubular mount projecting out of the body and the other with the tubular mount inside the body. By this means the distance between object glass and eyepiece is made to differ very considerably and widely different powers are therefore obtained. The optical performance is not interfered with as the object glass by this process is reversed By the use of two pairs of eyepieces, also of different powers, four powers are therefore obtained with the same object glasses. The accompanying diagram illustrates the principle upon which the Binomax is made. The object glass (a) is shown screwed I on to the body with its lenses projecting in front of the microscope. In dotted lines the position (a') is shown into which it can be screwed in the interior of the body. The image is formed by this object glass at a position (b) and is examined by the eyepiece. The point (o) is the position of the object. The distance between the object (o) and the position (a) and the distance between (o) and the position (a') are so arranged that (oa) is equal to (a'b) and (oa') is equal to (ab). The image is therefore in focus at (b) whichever way the object glass is screwed on to the body, but different powers are obtained. If the object glass is corrected to work in the position (a), it will also work in the position (a') and provided that the lenses are reversed, which is done by reversing the whole mount, the optical corrections are in each case equalty perfect. In a binocular instrument the object must lie at the intersection of the two optic axes of the microscopes and the change in power is therefore made without altering the distance between the object and the bodies of the microscope. --a'. In order to obtain an extra large field of view with the higher power eyepieces, we supply also the wide field form of eyepiece. The size o
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Keywords: ., bookcontributorgerstei, bookleafnumber63, booksubjectmicroscopes
