424 



SUMMAEY OF CUKEENT EESEARCHES RELATING TO 



The curtains suspended from the rods C and C are in four parts, all 

 overhipping each other and fastening together with spring snaps. They 

 are made of the heaviest grade of black sateen doubled. On the right- 

 hand curtain are pockets for pencils and cards. On the left side is a 

 pocket for lens paper. The pocket is provided with a flap to exclude 

 the dust. The upper curtain carried on the wire D is of single thick- 

 ness. The central curtain is in two parts so that they may be separated 

 to permit light to fall on the drawing board. The left-hand curtain of 

 the central set has a rectangle 1 in. wide bv 5 in. hio-h cut fromtthe 



Fig. 31. 



centre of the basal portion. Across the top of this aperture is stitched 

 a flap of double thickness, 3^ in. wide by 5| in. in length. To one 

 corner of the loose end of the flap is attached a tape which passes around 

 the tube of the Microscope and fastens to the other corner of the flap by 

 means of a spring snap. 



With the Microscope surrounded by these curtains it is impossible 

 to read the figures on the mechanical stage, and so the small light 

 (fig. 31, E) was installed. This can be adjusted by means of sliding 

 rods locked with winged nuts to hang directly over the stage. The 

 lamp arm is attached to the right-hand upright by means of a collar 



