234 VI. METALS.— Cobalt. 



Smith''s solder for tin. Lead, tin, of each 4 oz., bismuth 

 8 oz. ; will melt in boiling water. 



Onion's fusible metal. Lead 3 oz., tin 2 oz., bismuth 5oz. ; 

 melts at 197 deg. Fahr. 



Argentum musivum. Bismuth, tin, ana 2\h, ; melt together, 

 and add quicksilver lib.: brittle ; used as a silver colour. 



antimony. 



Regulus op antimony, Regulus, Antimony^ Stibium, Regulm 

 antimonii. From common antimony, saltpetre, and argol, ana p. 

 aeq., pulverized, injected by degrees into a red hot crucible, and 

 melted ; the regulus settles at the bottom; equiv. 5*5. 



2. Common antimony 16 oz., tartar 12 oz., nitre 6 oz. ; melt, 

 and pour out into a melting-cone; when cold, separate the regu- 

 lus, and if required to be very pure, remelt it once or twice ; throw 

 upon it, whilst in fusion, 1 oz. of nitre, and keep it melted for a 

 quarter of an hour. 



3. Common antimony, IG oz., calcine in a shallow vessel till no 

 sulphureous vapour arises from it, taking care it does not melt, 

 which requires 10 hours at least ; it yields 12 oz., 3 dr., 24 gr., of 

 calx ; mix this with as much soft soap, and melt : produces 9 oz., 

 6 dr. ,54 gr. of regulus. 



Martial regulus of antimony, Berpdus antimonii martioHs, 

 B. a, stellatus. Upon lib. and a half of small nails heated to 

 redness in a crucible, throw a mixture of lib. common antimony, 

 4 oz. nitre, and 2 oz. tartar : melt and pour out, separate the 

 regulus, and remelt it three or four times, throwing upon it 

 each time 2 oz. nitre. — Regulus is used to form small cups, 

 in which wine, being let to stand for a night, becomes emetic, or 

 balls are made of it, which are infused in wine for the same pur- 

 pose ; also to harden lead, and thus make a compound metal tit 

 for the best kind of pev/ter and for printers' types. 



Regulus Jovis. Made by melting regulus of antimony with 

 tin, generally in equal quantities, and casting it into the form of 

 a cup, for rendering wine emetic; is less brittle than the pure 

 regulus. These metals, mixed in various proportions, are used 

 for making mirrors, medals, &c. 



cobalt. 



Cobalt, Begidus of cobalt. Wash zaffre lib., by which means 

 about 5 or 6 oz. of calcined quartz, or sand, may be separated 

 from it ; mix the washed zaffre with soft soap, and melt it with a 

 violent heat ; produces about 3 or 4 oz. ; equivalent 3*25. 



2. Roast Cornish bright white cobalt ore, then smelt the oxide 

 with twice as much soft soap. 



