The fireside university of modern invention, discovery, industry and art for home circle study and entertainment . ound together, in their native molecules. Osmium is theheaviest of the Elements, and the most difficult to fuse. Theinternational standard of length, for the measurement of theearth, adopted in 1883, is wrought of an alloy of Platinum,Iridium, Rhodium, Ruthenium and Iron. This is supposed togive a metal bar that will change the least possible amount CHEMISTRY. 283 tinder the ordinarily varying temperatures. All these metalsmake good points for gold pens. How are these Metals obtai
The fireside university of modern invention, discovery, industry and art for home circle study and entertainment . ound together, in their native molecules. Osmium is theheaviest of the Elements, and the most difficult to fuse. Theinternational standard of length, for the measurement of theearth, adopted in 1883, is wrought of an alloy of Platinum,Iridium, Rhodium, Ruthenium and Iron. This is supposed togive a metal bar that will change the least possible amount CHEMISTRY. 283 tinder the ordinarily varying temperatures. All these metalsmake good points for gold pens. How are these Metals obtained? From a rare ore called Polyxene. There is usually a trace ofPlatinum in native Gold. It was the early workers in Platinum,like Wollaston, who in time determined the presence in Plati-num ore of the other heavy metals. Platinum was one of thediscoveries of the Spanish sailors who came to America. What are the uses of Platinum ? Russia coined money of Platinum, but was forced to recallthe coinage, because of its fluctuating value. Liebig said thatwithout Platinum crucibles, the composition of most minerals. Fig. 108. PLATINUM APPARATUS FOR ASSAYING PRECIOUS METALS. could not have been ascertained. Sulphuric Acid, the agent ofcivilization, is made most economically in a Platinum still, whichcosts a fortune. Every time you read by an incandescent (bulb)light, you are indebted to Platinum, for it is only by means ofPlatinum wire that the glass bulb can be kept from union of Platinum and Cyanogen (NH) is interesting toElectricians and other scientists on account of its fluorescence.(See X Rays.) Platinum is still very costly. What is the Tin Group ? The Elements called Titanium, Zirconium and Tin form thisfamily. Of the uses of Zirconium we shall speak in treatingthe Crium group, anon. 284 THE FIRESIDE UNIVERSITY. What is the history of Tin ? Here we again approach one of the metals that is moreancient than the written or even the traditionary history ofmankind. The
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