. The microscope; a simple handbook. Microscopes. 20 THE MICROSCOPE Eevolving has more than once made such a mistake and wondered why he could not focus his specimen. The nosepiece (S) of a microscope is the lower end of the body (M) provided with a screw for attaching object glasses. A revolving nosepiece is an appliance which screws into the nosepiece and which carries a revolving plate into which two or three object glasses can be fixed, known as double or triple nosepieces respectively. By rotating the revolving plate each object glass can be rapidly Fio. 7.—No. 3301, Dust-brou
. The microscope; a simple handbook. Microscopes. 20 THE MICROSCOPE Eevolving has more than once made such a mistake and wondered why he could not focus his specimen. The nosepiece (S) of a microscope is the lower end of the body (M) provided with a screw for attaching object glasses. A revolving nosepiece is an appliance which screws into the nosepiece and which carries a revolving plate into which two or three object glasses can be fixed, known as double or triple nosepieces respectively. By rotating the revolving plate each object glass can be rapidly Fio. 7.—No. 3301, Dust-brought into use, being held in the tight Triple Nosepiece. j,orrect position by a spring clip. The best form is made so that no dust can drop into the back of the object glasses and they can be safely left attached to the micro- scope. The extra length of the body caused by the length of a nosepiece is 15 mm., and the drawtube should be closed by that amount or set at 14:5 mm. instead of 160 mm. Sloan object An object glass changer is an apparatus for rapidly changing changer. ^j^^ object glasses by another method. Each object glass is screwed into a fitting which slips into an adapter that is fixed to the nosepiece of the microscope, -and as each fitting is provided with two adjustable abutment screws the object glasses can be individually adjusted so that they exactly register as regards the position of the field of view. Changing an object glass by this means is nearly as rapid and more accurate than that of a revolving nosepiece, and is far more convenient when the object glasses are to be used on difierent instruments or where more than three are used. ' It consists of an adapter which has on one side a sloping projection (A), and on the other a clamp screw (B) which actuates a bevelled nut (C). The adapter is clamped to the nosepiece of the microscope by a screwed ring (D), wMch is provided with slots, into which a half- penny will fit for tightening it up. Loose fittings
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