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Lecture demonstration of the 1769 transit by Benjamin Martin Benjamin Martin devised a large demonstration of the appearance of the 1769 transit. The device was 7 by 5? feet in size and mounted on a wall in his shop where he gave lectures. It showed the appeara... | Octant, Astronomical All brass octant. Engraved on crosspiece "B. Martin, London" and on index arm "The Gift of Ezekiel Goldthwait Esq. to the Apparatus of Harvard College in Cambridge N.E. May 1764." Given to replace ea... |
