It did take me to the page (Kindle Fire browser). Preceded by more info. this part might be relevant to your question.
Never heard of uranium toner, think I'll pass on that one.The bromo-iodide of copper intensifier is better in everyway than the uranium, although perhaps a little more expensive and troublesome to make up. But it may be used for bromide papers and lantern slides as well as for negatives. With all it has a toning action just as uranium, and is far more reliable.