Footnote 47
Part II, §21.  In fig. 5, the almicanteras, if accurately drawn, ought to shew as many degrees between the south point of the equinoctial circle and the zenith as are equal to the latitude of the place for which they are described.  The number of degrees from the pole to the northern point of the horizon obliquus is of course the same.  The latitude of the place for which the disc is constructed is thus determined by inspection.