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Directions pour l'usage de l'octant de Hadley perfectionné
Avec une nouvelle methode pour l'ajustement des verres pour l'observation posterieure. Par. P. et J. Dolland, dans le cimetiere de St. Paul, a Londres avex privilege du roi -
The description and use of four new instruments
viz. First. The variation and tide instrument. Second. A lunar instrument for shewing the places of sun and moon; also for finding the Time of High-Water at any Time and Place, both on Common and New Principles; to which is added, a Nautical Pocket Piece. Third. The improved analemma, for solving the Common Problems of the Celestial Globe. Fourth. The panorganon for solving those of the terrestrial globe; being very useful to young Students in Geography. By Benjamin Donn, Master of the Mathematical Academy, Bristol. Price Six-Pence