(Translated from the Rivista Marittima Italiana by F. W. Morrison.)
1. The triangle of position may be solved without trigonometrical computation in three ways:
(a) By numerical tables.
(b) By abacuses.
(c) By geometrical instruments.
2. Attempts of the first sort are very numerous and may be classified in groups according to the problem to be solved. The most important groups are those dealing with the calculation of the altitude, that of the hour angle, and that of the azimuth.
As the number of such attempts is constantly increasing1 we
1 The most recent attempts at the calculation of the altitude are: That of Ball (Altitude Tables, London, 1908, Potter), and that of Guyou (Nouvelle
Mithode pour determiner le point a la mer. Comptes rendus, 1908, No. 21).
Ball's large table is one of three entries and gives the altitude directly