Tables pour chercher, dans les latitudes navigables, l'azimut en mer, au moyen de l'angel horaire ... et Table pour naviguer sur le grand cercle

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Page xvi - ... the rim of the cover, are graduations, which are read as usual by a zero mark on the other rim. When the sun's light is too faint to give a distinct streak, or in observations of moon, star, or planet, the object may be viewed through the slit, either directly, or as reflected from the glass of the cover beneath the slit. In such cases the observation is made by taking the usual reading of the card at the lubber lino, and also the reading on the rim, giving the angle between the lubber line and...

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