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Updated: May 3, 2025
After having devoted several months to experimental trials of carbon, at the end of 1878, as already detailed, he turned his attention to the platinum group of metals and began a series of experiments in which he used chiefly platinum wire and iridium wire, and alloys of refractory metals in the form of wire burners for incandescent lamps.
Then there is this curious relation, that palladium and iridium are very much alike, so that you would scarcely know one from the other, though one has only half the weight of the other, and only half the equivalent power. So with iridium and rhodium, and osmium and ruthenium, which are so closely allied that they make pairs, being separated each from its own group.
It would send a messenger-ship to stop its own fleet's bombardment if Weald would accept payment for the grain-ships and their cargoes. It would pay in ingots of iridium and uranium and tungsten and gold if Weald wished it for all damages Weald might claim. It would even pay indemnity for the miners of Orede, who had died by accident but perhaps in some sense through its fault.
They use gold and silver where we use copper, and platinum and its alloys where we use iron and soft steel. All their weapons are made of iridium, and all their most highly-tempered tools, such as their knives, razors, and so on, are made of opaque arenak. I suppose you've noticed the edge on your razor?" "How could I help it?
Each spun at 40,000 r.p.m. It had to be machined from a special steel to assure that it would not fly to pieces from sheer centrifugal force. Each was plated with iridium lest a speck of rust form and throw it off balance. If the shaft and bearings were not centered exactly at the center of gravity of the rotors five hundred pounds of steel off balance at 40,000 r.p.m. could raise the devil.
The composition of this coin is platinum, 97.0; iridium, 1.2; rhodium, 0.5; palladium, 0.25; a little copper, and a little iron. It is, in fact, bad platinum: it scales, and it has an unfitness for commercial use and in the laboratory, which the other well-purified platinum has not. It wants working over again.
"You see," he said, "here is a top made of platinum, the heaviest of metals, except iridium which it would be impossible to procure enough of, and which would be difficult to work into the proper shape. It is surrounded you will observe, by an air-tight receiver, communicating by this tube with a powerful air-pump.
From their previous remarks it was clear that the asteroids, those fragments of an exploded and once populated world, orbiting out beyond Mars, would be for them. Osmium, iridium, uranium. The rich, metallic guts of a planet exposed for easy mining. Thousands of prospectors, hopeful characters, and men brutalized by the life in space, were already drifting around in the Asteroid Belt.
Iridium is mixed with platinum in order to increase its strength and durability. The normal standards of the metrical system are made of platinum-iridium on account of its known immutabilty. In 1882, platinum stood 15 per cent. below its present value; but its increased employment for industrial purposes led to the subsequent improvement in price.
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