ITEM — unspecified: Box 5, folder 20 Identifier: hsi00001
Articles and pamphlets, 1858-1860, undated, 1858-1860 Digital
Scope and Contents
Contains copies of Alvan Clark's (1804-1887) New double stars (1858) and New micrometer for measuring large distances (1860); Richard F. Bond's Description of Bond's isodynamic escapement, for astronomical clocks (1860); an 1883 announcement from the Harvard College Observatory on the time change; and an undated brochure on Invar, a patented alloy of nickel-steel, issued by J.H. Agar Baugh, sole agent.
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