Calibration table for the Marinoni position micrometer by J. Scherer
Object notes Associations
On the last page of volume IV of the Records of the Specola di Bologna, dated May 1734, there is a calibration table for the micrometer written by Eustachio Manfredi (1674-1739), who was the first astronomer of the Bologna Observatory. It gives the relation between a turn of the micrometric screw and the angle measurement.
Object contributed by Museo della Specola, Department of Astronomy, Universit? di Bologna