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An instrument for obtaining the correction of lunar distances from the Sun

1850-1858
Platinotype print of plate of Backstaff, from Davis's "Seaman's Secrets", 1607, reprint in Hakluyt Society's volume series, vol LIX, p.334

Platinotype print of plate of Backstaff

1914
Platinotype print of plate of backstaff, from Davis's "Seaman's Secrets", 1607, reprint in Hakluyt society's volume series, vol LIX, p 332

Platinotype print of plate of backstaff

1914