Browse Categories
Calibration table for the Marinoni position micrometer by J. Scherer 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 ast... | Marinoni position micrometer by J. Scherer, Vienna, 1732: brass, length 24.5 cm It is almost certainly the only remaining example of the micrometers designed by Giovanni Giacomo Marinoni from Udine (1676-1755). Marinoni sent to Eustachio Manfredi (1674-1739), first Director of th... | Micrometer by Troughton and Simms, used by the 1874 Dutch expedition on ReunionThe director of the Leiden Observatory, Frederik Kaiser, bought this micrometer after Airy in 1858. The micrometer was lent to the 1874 expedition to Reunion. Troughton & Simms, London, 1858 Museum ... |
Micrometer, Photographic Jaw micrometer. Unsigned. Transferred from the U.S. Naval Observatory. This is one of eight identical instruments made for the eight American parties sent to observe the Transit of Venus in 1874. M... |
