. Beck microscopes. Microscopes. No. jno No. 3370. Abbe camera lucida £4 5 0 This apparatus is made for the production of correct drawings of images seen through the microscope. It consists of a prism mounted to fit over the eyepiece of the microscope and a large mirror placed a few inches from it. The prism is silvered but has a small clear aperture in its centre. The paper upon which the drawing is made is reflected by the mirror into the prism and in turn by the silvered surface of the prism into the eye. At the same time the object is seen through tire clear aperture in the prism. Thus the
. Beck microscopes. Microscopes. No. jno No. 3370. Abbe camera lucida £4 5 0 This apparatus is made for the production of correct drawings of images seen through the microscope. It consists of a prism mounted to fit over the eyepiece of the microscope and a large mirror placed a few inches from it. The prism is silvered but has a small clear aperture in its centre. The paper upon which the drawing is made is reflected by the mirror into the prism and in turn by the silvered surface of the prism into the eye. At the same time the object is seen through tire clear aperture in the prism. Thus the object is seen superimposed upon the paper and can be readily drawn. This Abbe camera lucida is of rigid design and is made of a light metal, so that the total weight is 7 oz. The fitting carrying the prism is hinged and can there- fore be readily turned aside when not desired for use, or for changing eyepieces. A series of neutral tint glasses for equalising the light in the two fields are mounted in a revolving fitting. The microscope should preferably be used vertical, but if inclined, the drawing paper must be set in the same plane as the No. 3371. Simple form of Abbe camera lucida £3 3 0 The large mirror is replaced by an adjustable prism. With this form, a lens is supplied to bring the pencil and paper into focus at a distance of about 10 ins., which in this case is the approximate distance between the eyepiece and paper. A neutral glass is also supplied. No 3368. Beck liorizontal camera lucida £1 17 6 This again gives an image of the paper by means of a prism, but it is constructed for use with the microscope placed in a hori- zontal position. The image of the paper is reflected into the eye by a half silvered surface on the prism and the object is at the same time viewed through this half silvered surface. A compensating lens and neutral glass are supplied No. 3369. Beck vertical camera lucida /2 10 0 This is constructed on similar lines to the horizontal pa
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