On a Neiv Mechanical Stage, By Edward M. Nelson. 187 
hold the slip by the two lower comers, fig. 14. This method obvi- 
ates all gripping of the slip, and does not interfere with the feeling 
of the working distance by the finger. Slips from 2h in. to 4J in. 
can he taken. 
Fig. 14. 
The stage has been made of aluminium for lightness, and its size 
is 4J x 7 in. The stand has a spread of tripod of 8 x 8 in. The 
length of the body when closed, including the rotating nose-piece, is 
•5J, and when extended by means of the rack-work and sliding draw- 
Fig. 15. 
tubes is 11 J in. long, so that it will work equally well with objectives 
-corrected for either the long or short tube. The weight of the instru- 
ment is 7 lb. 10 oz. 
o 2 
