Catalogue of the British Section.—Appendix. 
9 
PLATINUM AND PRECIOUS METALS 
EXHIBITED BY 
JOHNSON, MATTHE - ? & CO., 
HATTON GARDEN, LONDON, 
Smelters and Refiners of Gold, Silver, 
/latinum, Anlimony, Bümuth and Quick- 
silver, and Manufadurers of Magnesium, 
Potassium, Sodiurn, and rare Metallurgical 
and Chemical Products. 
PLATINUM STILL, value 95,000 frs., to con- 
centrate 200 cwts. (10,000 kilos.) Sulphuric Acid 
per day. This Still is made of Cheraically pure 
Platinum, and Combines the most recent improve- 
ments in construction. The tenacity and strength 
of the metal are of the highest degree attainable 
by careful workmanship. The joints are auto- 
genously soldered (i.e. without Gold Solder), the 
absolute peifection and superiority of which pro- 
cess have been proved by the results of working, 
for many years, more than eighty concentrating 
boilers of capacities varying up to 650 litres, in use 
in most of the large and well-known manufactories 
throughout the world. 
COIL SYPHON,—Length of Tube 10,000 milli- 
metres, a great improvement tipon the ordinary 
single or double Tube Syphons of 4,000 to 5,000 
millimetres in length. It is more convenient and 
economical in working, requires less space, is less 
liable to injury, and cools the Acid to an extent 
quite unobtainable by the old method. A large 
number are in successful Operation. 
An arrangement is attached by which the Syphon 
empties itself if, by accident or carelessness, the 
boiter is not properly supplied with Acid, thus 
affording great protection against the most common 
cause of injury to these valuable articles. 
PLATINUM ASSAY APPARATUS, by 
the use of which Gold Assays can be made with 
greatly increased accuracy, rapidity, and economy. 
The especial attention of Mints and Foreign 
Assay Offices is called to this Apparatus, particu- 
lars of which will be forwarded on application. 
PLATINUM UTENSILS for Laboratory use. 
Crucibles, Capsules, Dishes, etc., etc. 
IRIDIO-PLATINUM Gun Vents for heavy 
Ordnance, and Standard Weights and Measures, 
as decided upon by the Paris Commission for 
International use. 
NUGGET OF PURE PLATINUM. — 
YVeight, 4,728 grammes of very perfect form (only 
one langer specimen is known to exist); also 
Platinum Ore front various localities. 
PALLADIUM.—Ingot of pure Palladium, value 
48,000 frs., extracted from native Platinum and 
Gold of the value of 26,000,000 frs. 
Precious and rare Metals; Chemical and Metallur 
gical Products. 
In the Paris Exhibition, 1867, JOHNSON, MATTHEY 
& CO. exhibited Platinum Apparatus, Rare and Precious 
Metals, and Chemical Preparations of the value 0/500,000frs., 
and were the only manufadurers 6f Platinum to vuhom the 
highest awards were made in each of the three classes under 
'which they exhibited. 
Fondeurs et Affineurs d'Or, Argen/, Platine, 
Antimoine, Bismuth, Argent-vif ei Fabri- 
cants de Magnesium, Potassium, Sodium et 
Produits Metallurgiques et Chimiques. 
ALAMBIC de PLATINE, valeur 95,000 frs., 
pouvant concentrer 10,000 kilos. d’Acide Sulfurique 
par jour. Cet Alambic est fait de Platine chimique- 
ment pur et combinant les plus nouveaux perfec- 
tionnemem s. La tenacitfi et la force du metal sont du 
plus haut degre quepuisseatteindreunemanipulation 
habile. Les jointures sont soudees autog.nement, 
c. ä. d., faites sans l’emploi de Tor. procSde dont la 
perfection et la supSriorile ont 6tfi etablies par l’ex- 
pfoience de plasieurs annees; plus de quati e-vingts 
chaudieres, faites d’apres le mente proeädg, et d’une 
Contenance allant jusqu’ä 650 litres, ätant employees 
dans les plus grandes fabriques de tous pays. 
SYPHON SERPENTIN.—La Longueur du 
tube est de 10,000 millimetres, ce qui est beaucoup 
plus avantageux que les Syphons ordinaires ä tubes 
etroits de 4,000 ä 5,000 millimetres. II est plus 
commode et plus Sconomtque, occupe moins d’es- 
pace, et refroidit l’acide ä un degre que ne peut 
atteindre Tancien procedg. Plusieurs sont actuelle- 
ment employfis et partout avec le plus grand succes. 
Une disposition specinle permet le Syphon de se 
vider de lui-meme, quand, par accident ou manqtie 
de soins, la chaudiere n’est pas suffisament ap- 
provisionnee d’aeide. Ce perfectionnement pre- 
vient la cause la plus commune des accidents aux- 
quels ces precieux articles sont sujets. 
APPAREILS en PLATINE, pour les essais 
d’or, remplacemant les mattras avec plus de prfi- 
cision, de rapidite et d’economie. 
Ces Appareils, dont 011 enverra, surdemande, des 
descriptions detaillees, meritent Vattention de la 
Monnaie et des Bureaux d’ Essais Etrangers. 
INSTRUMENTS de PLATINE pour la- 
boratoires, creusets, capsules &c. 
TRIDIO-PLATINE.—Lumt&res pour canons de 
gros calibre, etalons de poids et mesures, de la 
forme adoptee par la Commission de Paris pour 
usage international. 
PEPITE de PLATINE PUR, pesant 4,728 
grammes, de forme parfaite (on ne connait qu'une 
seule pepite plus grosse que celle ci); Minerals de 
Platine de differentes localites. 
PALLADIUM,—Lingot de Palladium pur(valeur 
48,000 frs.), extrait de Platine et d’or natifs, de 
26,000,000 frs. de valeur. 
Metaux rares et precieux; Produits Chimiques et 
Metallurgiques. 
A T Exposition de Paris en 1867, JOHNSON, MATTHEY 
8t Cie. exposerent des Appareils de Platine, des Metaux 
rares et precieux et des Preparations Chimiques, d'une 
valeur de 500,000 frs., et furent les seuls fabricants de 
platine quiobtenirent les plus hautes recompcnses danschac* 
une des trois classes de leurs produits. 
b