88 
Saccliarimeter. 
No. 
61 
Maries 
SaCChcirini6ter, for estimating the percentage of sugar in 
fluids. With tube for liquids 200 mm fong made to slide in a 
brass tube, which carries a polariser and double quartz plate at 
one end and at the other an analyser with divided circle. The 
circle is divided to semi-degrees, and tenths can be estimated 
with accuracy. Observation is made by adjusting the so-called 
transition colour on both halves of the quartz plate, the tube being 
directed by hand towards a white surface. Only suitable for 
fluids containing a small percentage of sugar. (Fig. 44.) With 
directions 
65.— 
61» Idem with small telescope for the more accurate observation 
of the double quartz plate 
75. 
63 *Warm Chamber for keeping microscopical objects at 
certain temperatures during observation. After Pfeiffer. 
The heating-stages ordinarily used for this purpose leave the 
observer in doubt, as to whether the temperature, to which the 
object is raised, really corresponds to that indicated by the 
thermometer. The present arrangement aff"ords full security on 
this point, as it permits of the object, together with the stand 
and the surrounding air being brought up to and maintained at 
a certain temperature. 
