Augsburg, Weh, 1655.
Organon logikon, Kurtzer grundtlicher...Underricht, Zuberaitung und gebrauch, Des Circkels Schregmess und Linial in wahrer proportion.
Rare edition and a fine copy of Galgemayr's very influential text describing the construction & use of two instruments, a proportional compass and a lineal compass for the measurement of volumes and surfaces. The former, closely resembling Galileo's proportional compass, was a popular calculating device used throughout the 17th C...... More