Micrometers

Micrometer Eyepiece with Movable Scale

Screw Micrometer Eyepiece No. 151. No. 152.

No.

£ s. d. Codeword

151. Screw Micrometer Eyepiece for the accurate measurement of objects as seen in the eyepiece. The apparatus is provided with a Ramsden eyepiece having below its field lens a scale divided on glass in whole and half millimetres, below and across which a single line index is made to travel under the action of a micrometer screw. The latter is fitted with a drum divided into 100 parts, and by one complete rotation of the drum displaces the index 1/2 mm across the fixed scale; hence each division on the drum corresponds to an interval of 0,005 mm = 5 ft. The micrometer value of each interval should be calibrated for each objective with the aid of a stage micrometer. The eye-lens of the eyepiece is adjustable to enable the observer to accurately focus the scale.

The apparatus slips into the draw-tube of the microscope like any ordinary eyepiece and may be fixed in position by

the milled head screw shown at the side...............2.10. 0 Mierodon

152. Micrometer Eyepiece with movable scale of 10 mm divided into 100 parts. The scale is situated in the plane of the eyepiece stop and can by the rotation of the micrometer screw be made to travel across the field of view. This enables one to set any convenient line of the scale accurately to the extreme boundary of an object which is to be measured without having to displace the object on the stage. The eyelens of the eyepiece is made to slide up or down

and may thus be accurately adjusted to suit the user’s sight 1. 5. 0 Mieromeria

44D, engl.

33

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