74 The DoBrine

C 0 R. I.

Hence, from tlie Direction and ho-riffental Amplitude given, the DistanceAx on a Plane of any given Ascent isfound: for 7 ", MAt~*T, MA x^T",A Mx y . and having the Angles at theBase you have the Angle A x M, thenS 1 , A x M: S y AMx :: A M: A x. theDistance requir’d.

COR. It

Plence, from the Direction and DPstance on a Plane of a given Ascent,the horizontal Amplitude is found.

COR. in.

Hence al so, from the horizontal A nv"plitude and Distance on a Plane of 3given Alcent being given, the Directson may be found ; for in the Triangle

Ax hi