( ^^47 ) 



(ireal care was Itcslow cd on llic iiisiilalioii of all llic apparaliis. 

 The c'ondiu'liiig" wires were str()iiii,ly insulaled aiid were, as far as 

 possible, in eoiilaet willi air oidy. Kaeli plaliimni disli was placed 

 on a eopper plale which stood on a glass plale; Ihe laller was 

 earried by i)orcelain insulaloi-s which acted as feet. 



For a roniili orientation a technical aniinetei" was ineliid(Ml in the 

 eircnit ; the cm-rent was taken fnmi 1 to 3 storage cells. 



5. The antimony solutions which were subjected to electrolysis 

 were contained in sj^acious beakers (I litre) (/> in lig. i) in which 

 constant stirring c(>uld take i)lace by means of Witt's centrifugal 

 stirrers. A Helmiici hot-air motor ke|)t all the stirrei-s in motion. 

 The rods of antimony w hich served as [)ositive electrodes were sur- 

 rounded by a piece of linen which was iixed to the rod a\ ith |»latiinim 

 wire, or bv glass tubes closed at the lower end containing a large 

 number of not too small perforations {(>, O, (> . . .) (3 or 4 ni.m.). 

 The object of surrounding the rods was to [»revent any loose particles 

 (tf antimony fnnn getting into the li((uid. 



As negative electrodes we used platinum wires {P) about '10 cm. 

 in length and 0.3 — 0.4 mm. thick; they were provided at the up})cr 

 end with the capillar glass pieces {C), on which a mimber was 

 engraved. 



Both antimony rods and platinum wires were attached to copper 

 binding screws which moved along glass standards (*S'). In order to 

 prevent contamination of the licpiids by contact \\\{\\ co|)j)er, a i)iecc 

 of platinum wire {Pt) was placed between the binding screws and 

 the rods of antimony or platinum suspended thereliy. 



G. The experiments were now conducted as follows: After the 

 platinum wires had been weighed they were |»ut in their places; 

 the silver coulometers were comiected up and llic cni-reiit closed. 

 At the commencement the strength of the cnrrenl may only amount 

 to a few hundredths of an ampere; if this is exceeded, evolution of 

 hydrogen instead of se[)aration of antimony takes place. ^\ hen the 

 precipitate on the platinum wires had reached a certain ([uanlity, 

 when in other words, the surface had become eidarged the strength 

 of the current was iiicreased and gradually raised to about 0.3 ampère. 



At the end of the electrolyses the rods were rinsed with a VI per 

 cent solution of tartaric acid'), then washed with water, alcohol and 

 ether and dried over suli)huric acid in a desiccator. 



1) }jy a special cxpci-iinent we had coiivituMd oiirselvo?; thai this did not cause 

 any peicepliblc dimimiliun in weight. 



