The action in question was brought against Gutenberg in 1439 by Georg Dritzehn, the brother of one Andres Dritzehn, deceased, for the restitution of certain rights which he considered due to himself as his brother's heir. From the testimony of the witnesses as set down in the records of the trial, we gather that Gutenberg had entered into partnership with Hans Riffe, Andres Dritzehn, and Andres Heilmann; and one of the witnesses deposed that Dritzehn, on his death-bed, asserted that Gutenberg had concealed "several arts from them, which he was not obliged to show them." This did not please them, so they made a fresh arrangement with Gutenberg and further payments into the exchequer, to the end that Gutenberg "should conceal from them none of the arts he knew."
Again, Lorentz Beildeck testified that after Andres Dritzehn's death, Gutenberg sent him to Claus, Andres' brother, to tell him "that he should not show to anyone the press which he had under his care," but that "he should take great care and go to the press and open this by means of two little buttons whereby the pieces would fall asunder. He should, thereupon, put those pieces in or on the press, after which nobody could see or comprehend anything."
Besides this, Hans Niger von Bischoviszheim said that Andres Dritzehn applied to him for a loan, and when witness asked him his occupation, answered that he was a maker of looking-glasses. Later on, a pilgrimage "to Aix-la-Chapelle about the looking-glasses" is mentioned.
By these records, from Mr Hessels' translation of which the above quotations are taken, two things at least are made clear. First, that Gutenberg was in possession of the knowledge of an art unknown to his companions, which he was desirous of keeping to himself, and which those not in the secret wished to learn; and secondly, that a press containing some important and mysterious "pieces," which was not to be exhibited to outsiders until the pieces had been separated, played a prominent part in this secret work. The "looking-glasses," apparently, were imaginary, and intended for the misleading of too curious enquirers. But it has been ingeniously suggested that the word _spiegel_, or looking-glass, was a cryptic reference to the _Spiegel onser Behoudenisse_, or _Mirror of Salvation_, and that Gutenberg and his assistants were engaged in preparing the printed _Speculum_ for sale at the forthcoming fair held on the occasion of the pilgrimages to Aix-la-Chapelle in 1439. This part of his plan, however, was frustrated by the postponement of the fair for a year.