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Tracking down the lead, Maringer soon was in possession of a screw press that weighed more than a ton.

"In historic printing they used a hand-turned screw press where two moulds were brought together against a round metal planchet. Over time the repeated striking of the moulds meant they lost definition and also slipped a little out of alignment."

By the end of the day he had a stack of 100 sheets or so, which he would drain overnight, clamp in a screw press and dry on a wall of steam-heated sheet metal the following day.

Then add enough wood naphtha to make a stiff paste, and after standing an hour transfer to a fine linen bag and express the thick liquid in a screw press.

The screw press was the earliest form of machine used, and then came the hydraulic press.