The Description, Use, and Excellency of a New Instrument, Or Sea Quadrant, Invented by Caleb Smith, for Taking Altitudes of the Sun, Moon, and Stars, from the Visible Horizon (as Well as Any Other Angular Distances at Land Or Sea) Without Pediment Or Interruption from the Ship's Motion ; Whereby the Latitude at Sea May be Obtained with Greater Certainty ... to which is Added, an Essay to Make this Quadrant Serviceable ... when There is No Horizon to be Seen. As Also ... for Discovering the Variation of the Magnetic Needle ... Without Any Astronomical Calculation

Auteur : Caleb Smith

Date de publication : 1740

Éditeur : Inventor

Nombre de pages : Non disponible