"The publication of this work got Faulhaber into difficulty with the authorities, yet again, because he published it without the permission of those responsible for the supervision of schools. It has been described as a work on the sector, but this is an error, perhaps due to the fact that it is often found bound with his work on the sector (see lot 170). It is only three and a half pages of text with a folding plate showing a semicircular instrument divided into 220 parts. The device was invented in the Netherlands by Daniel Speckle and was evidently intended for use by surveyors" (Tomash & Williams).
The colophon reads: "Geben in Ulm den 27 December/ Anno 1609".
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