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XVII. On the Properties of Electro-deposited Antimony (concluded). By G. Goke, Esq. 
Communicated hy Professor Stokes, Sec. B.S. 
Eeeeived May 24, — Eead June 19, 1862. 
Second variety of active Electro-deposited Antimony. 
92. In addition to the variety of electro-deposited antimony obtained from a solution of 
teroxide of antimony and hydrochloric acid, a second variety may be obtained from a 
solution of terbromide of antimony in the following manner. 
93. Dissolve one part of teroxide of antimony in 10 parts of hydrobromic acid of 
sp. gr. about 1'3, filter the solution through a funnel loosely plugged with asbestus, and 
electrolyse it by means of three Smee’s elements and an anode of antimony in the usual 
manner, at a speed of deposition of about 3 to 5 grains per square inch per hour. The 
exact proportion of the ingredients of the solution is not a matter of great importance. 
94. The electrolytic conduction is free, and a coherent metallic deposit is quickly 
obtained. The deposit, when thin, is occasionally quite bright and black, and very similar 
in appearance to that obtained in the chloride solution, but generally it is of a much 
lighter colour and quite dull in aspect ; it is at first scaly, exhibiting the unequal cohe- 
sive action already described (17.), but in a less degree than the first variety, and emitting 
but slightly audible crackling sounds during its formation. During the process of depo- 
sition solitary bubbles of gas occasionally adhere to the receiving surface, and cause deep 
conical holes in the deposit, especially if the solution is not sufficiently dilute ; in 
escaping, these bubbles sometimes emit a chirping sound ; in some instances the holes 
were so numerous as to give to the substance the appearance of a metallic sponge. 
95. The deposited substance is firm and moderately hard, but rather less so than that 
formed in the chloride solution ; its fi’actured surface has also a bright metallic lustre 
similar to that of the first variety. The specific gravity of two specimens was 5 ’415 and 
5-472 at 60° Fahr. 
96. By contact with a red-hot wire, it exhibits a similar molecular and thermic change 
to that manifested by the chloride variety (19.). A piece -^th of an inch thick, at 60° Fahr., 
touched by a red-hot wire, exhibited strong molecular action at the points touched, but 
the action did not spread throughout the mass. A second similar piece, heated to about 
200° Fahr. in a porcelain capsule upon the surface of boiling water, when touched by 
the heated wire manifested stronger and more extended change, but did not discharge 
the whole of its heat except by numerous contacts of the wire. A third piece in a 
platinum dish upon the surface of a solution of chloride of calcium at 268° Fahr., evolved 
all its heat instantly with explosive violence and projection of pieces of the metal by a 
