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.
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.
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
