VII. MISCELLANEOUS. 561 



2664. Description and drawing of an Apparatus for the De- 

 termination of Sulphur (see the accompanying treatise : 

 " Aphorismen iiber Steinkohlen von Dr. E. Muck."') 



BerggewerkschaftskassCy JBochum, Rhenish Prussia. 



2665. Reich's Apparatus for estimating Sulphuric 

 Acid. Royal Mining Academy, Freiberg, Saxo.ny. 



2666. Winkler's Apparatus for technico-chemical Gas 

 Analysis. Royal Mining Academy ', Freiberg, Saxony. 



2667. A Soleil-Scheibler improved Polarising Appa- 

 ratus (or optical saccharometer) for determining sugars. 



Dr. C. Scheibler, Berlin. 



All the instruments exhibited by Dr. C. Scheibler are for the use of chemical 

 laboratories in beet-root sugar refineries. They are described in the " Journal 

 " of the Society for the Advancement of the Beet-root Sugar Industry of the 

 " German Empire," edited by the exhibitor, and are used in the chemical 

 laboratory of the society of which Dr. C. Scheibler is the director. 



The Soleil-Scheibler Polariscope, serves for the determination of the optical 

 rotary power of sugar solutions, besides ascertaining quantitatively the amount 

 of the sugar contained therein. The improvements made by the exhibitor 

 in this instrument (and described in the Zeitschrift for 1870, p. 609) are as 

 follows: 



(1.) In the place of the two quartz-wedges sliding against one another in the 

 earlier instruments, and which carry the scale and vernier, these instruments 

 have the wedges so arranged that only one of them carrying the scale is 

 movable, the other bearing the vernier is fixed. By this means a much firmer 

 motion of the first wedge is secured, and the so-called dead-motion of the 

 setting-screw does not easily occur. In consequence of this the zero point of 

 both wedges remains unaltered, which is a matter of considerable importance. 



(2.) The above-mentioned vernier resting on a firmly fixed quartz-wedge 

 is movable within definite dimensions, by means of a key, without the position 

 of the wedge itself being changed. In this way an accurate adjustment to the 

 zero point is easily accomplished. 



(3.) For the more convenient reading off of the experimental numbers 

 obtained, a small round magnifying mirror is fixed above the scale. 



(4.) To prevent any side rays interfering with the readings, all light is kept 

 out by a completely light-tight sliding casing fitted over the observation tubes. 



2668. Mitscherlich's simple Polarising Apparatus for 



use in sugar refineries. Dr. C. Scheibler, Berlin. 



2669. Scheibler's Apparatus for the estimation of Car- 

 bonate of Lime in bone charcoal, as well as for the quantitative 

 volumetric analysis of carbonates generally. 



Dr. C. Scheibler, Berlin. 



This apparatus was described by Scheibler in the above-mentioned Zeit- 

 schrift for 1859, p. 285, and for 1861, p. 525. 



2670. Scheibler's Apparatus for the volumetric esti- 

 mation of Carbonic Acid contained in the gases of saturated 

 solutions. Dr. C. Scheibler, Berlin. 



Described in Zeitschrift for 1866, p. 644. 



39508. 'N n 



