2 works bound in one volume, 4to (190 x 148mm.), contemporary orange stiff paper wrappers, 3 original ties, lower cover holed where fourth tie is missing
“In addition… this work… describes an instrument to be used for perspective drawing and (p. 25) a newe geheime Invention (new secret invention) to be used for surveying—the secret device was the magnet!” (Tomash & Williams).
The second work is often thought to be about the sector as well, but actually deals with a slightly different instrument, invented in the Netherlands by Daniel Speckle, for the use of surveyors. Faulhaber discusses it again in another 1610 work (lot 169).
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