BAIRD &1ATLOCK (LONDON) LTD. 



MICROMETERS. 



1027 

 1027 T Screw Micrometer Eyepiece for the accurate measurement of large objects 



This apparatus is provided with a Huyghenian eyepiece, between the eye and field lenses of which there is a 

 millimetre scale ruled on glass, and above this a movable index whose position is controlled by a micrometer screw 

 terminating externally into a graduated drum. The value of each division on the drum, about 5 \ of the micro- 

 meter value of the objective, must be determined for each combination of ocular and objective by means of the 

 stage micrometer. The eye lens of the ocular is movable for accurately focussing the scale. The apparatus slips 

 into the tube of the microscope like any ordinary eyepiece and is fixed in position by a thumbscrew at the side. 



1028' Micrometer Eyepiece. The mount unscrews in the centre for the introduction of the 

 micrometer scale. The eye lens is movable for accurately focussing the scale 



1029' Glass Micrometer for the Eyepiece, to drop on the diaphragm of the eyepiece. Scale 

 of 5 mm. divided into 100 parts . . 



1030' 1 ' Glass Micrometer Eyepiece, 10 mm. divided into 100 parts 



1031 T Stage Micrometer, i mm. divided into 100 parts ruled on glass 



1032 T Stage Micrometer, photographed on glass, 2 mm. divided into 200 parts 



1033 T Eyepiece Cross Line Micrometer, divided into squares for counting scattered objects 

 in the field. Mounted. Interval between the lines 0.5 mm 



2 10 



10 





 

 

 



5 



1034 r Ehrlich's Eyepiece 



1034 



1 10 



Contains a diaphragm with a square opening, which is adjustable within definite ratios for purposes of counting. 

 This eyepiece is designed to facilitate the estimation of the relative numbers of red and white blood corpuscles in dry 

 stained preparations. Full directions accompany each instrument. 



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