243 SUMMARY OF CURRENT RESEARCHES RELATING TO 



MICROSCOPY. 



A. Instruments, Accessories, etc.* 

 (1) Stands. 



Winkel's Stand No. If — This stand (fig. 81) has been specially 

 designed for photomicrographic work and visual observations demanding 

 the greatest precision. 



It has rack-and-pinion, coarse- and new form of fine-adjustment, 

 one division of the drum of which represents a vertical movement of 

 0"002 mm., centring rotating mechanical stage, the lateral mechanism 

 of which can be removed ; the rotation can also be clamped by means 

 of a milled head on the left-hand side of the instrument ; iris- 

 diaphragm mounted beneath the stage ; substage illuminator No. 1, 

 body-tube 6 cm. in diameter, thus permitting the use of the low- 

 power micro-luminars without cutting down the field, after removing 

 the draw-tube, which is of the usual standard gauge graduated to 

 millimetres. 



The whole is mounted on a heavy horseshoe foot with hinged up- 

 right-hand clamp ; the instrument can thus be set at any convenient 

 inclination from vertical to horizontal ; the fitting carrying the plane 

 and concave mirror can be removed when the instrument is required for 

 use in the latter position. 



Winkel's Travelling Microscope.:}: — This instrument (fig. 32) which 

 is of medium size, can, by hinging stage and foot, be fitted into a case 

 11| x 8 X 3J in., thus rendering it much more portable than our 

 laboratory models of similar size. 



It has rack-and-pinion, coarse- and micrometer screw fine-adjust- 

 ment, square stage fitted with iris-diaphragm, substage illuminating 

 apparatus, with screw focusing adjustment, graduated draw-tube, double 

 nose-piece, and joint for inclination. 



The method of packing will be obvious from the illustration. Before 

 rotating the stage to pack the instrument, the mirror, which slides in a 

 groove, must be lowered, and on again setting up the instrument care 

 must be taken to see that the stage is brought right over to the stop 



* This subdivision contains (1) Stands ; (2) Eye-pieces and Objectives : (3) 

 Illuminating and other Apparatus ; (4) Photomicrography ; (5) Microscopical 

 Optics and Manipulation; (6) Miscellaneous. 



t R. Winkel, Gottingen Catalogue, 1911, pp. 22-3 (1 fig.). 



* Tom. cit., p. 45 (1 fig.). 



