260 



^ J. Description of tJw inirromcchrtrimrter. 



Tlie principal part of the miorosaccliarimeter (see the Plate , tig- 1) 

 is made of a capillary tube of thick glass, with an inner diameter 

 of about 2.8 mm. At a short distance from one of the ends this 

 lube has been blown to a cylindric reservoir, the content of which 

 is about Ice. and with a short neck. The other end of the tube has 

 been enlarged to a funnel, of a content of about 1.5 cc. The lengthof 

 the glass apparatus, measured from the point on the utmost right to 

 the utmost left is about 35 cm. (in connect with the usual dimensions 

 of the thermostats). The capillary tube has such a curve under the 

 reservoir that the longest, straight part (see fig. 1) mounts to about 

 half way the reservoir. This long straight part has been calibrated ; 

 the scale-division is in parts, each from 0.01 cc. The zero-point 

 is as near as possible to the downward directed curve and the 

 division continues till the upward bent. With the here mentioned 

 dimensions this division will go to about 0.9 cc. and it is desii-able, 

 that it should not be much shorter. The dimensions are for the rest 

 so chosen, that the content of the reservoir is a bit smaller than 

 that of the bent and straight part of the capillary tube and the 

 funnel together, a circumstance, which is to be observed by the 

 constructor of the apparatus. The fiuishing of the neck of the small 

 reservoir is to be done carefully. The opening of that neck is 

 upward somewhat enlarged in a conical form, while also from the 

 very short, narrow part of this opening downward a very regular 

 conical transition must be (see tig. 3). 



The glass apparatus is placed on a small stand (see fig. 2), made 

 from a wooden platter (5.5 x 38 cm'.), on which a wooden block 

 has been fastened, that bears a cork clamp. This clamp is made 

 from a conical cork of good quality (largest diameter 4 cm., high 

 3.5 cm.). This cork has on the short side a groove, which continues 

 to some distance from the large side. The curved part of the 

 capillary tube tits in this groove. The cork is further on at two 

 sides tiled parabolical (see fig. 2). 



The glass apparatus is to be fixed in every desired stand by a 

 brass pin with winged nut, fitting in the cork just above the curve 

 of the capillary tube. By remoxing the brass pin the glass apparatus 

 can be taken from the stand, which is necessary to clean it. To 

 sterilize the apparatus is superfluous, but it should be dried carefully. 



The two mercury levels, being after the fermentation in the reser- 

 voir and in the divided part of the capillary tube, can be placed 

 on the same iieiglit by different simple ways. A rather good method 



