Details
A 16th Century mariner's brass astrolabe, (possibly Portuguese), all marks obliterated but of typical form; the mater (wheel) showing signs of extreme heat, perhaps partially melted during a wreck fire, lacking alidade, axis, pin, retaining nut and suspension loop 6 7/8in (17.5 cm) diameter
See illustration
c.f. stimson, Alan ; The Mariner's Astrolabe; many examples of this typical Portuguese example are shown. (a) p.122/123 (Batavia III); (b) p.p. 130, 131 (Concepcion A & B); (c) p.p. 136, 137 (Isle au Morts); (d) p.p. 160, 161 (Banda II); (e) p.p. 164, 165 (Atocha); and others.
See illustration
c.f. stimson, Alan ; The Mariner's Astrolabe; many examples of this typical Portuguese example are shown. (a) p.122/123 (Batavia III); (b) p.p. 130, 131 (Concepcion A & B); (c) p.p. 136, 137 (Isle au Morts); (d) p.p. 160, 161 (Banda II); (e) p.p. 164, 165 (Atocha); and others.