Chatterton, E. Keble (Edward Keble), 1878-1944 · London : Sidgewick & Jackson, litd · leaf 227
IPS AND WAYS OF OTHER DAYS that because the sea causeth the shippe to heave the best way to take the suns height was with the cross-staff : furthermore, the degrees on this instrument weremarked larger than on the astrolabe. Also in a largerinstrument an error was seen sooner. The method ofuse in… … A Sixteenth-Century Navigator using the Cross-staff. Put the transitorie (or cross-piece) on the long staff,set the end of the long staff close to the eye, winkingwith your other eye, and then move the transitoryforwards or backwards until you see the lower endof it ( being just with the horizon )…
Ships · Shipbuilding · Navigation
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