78 The DoBrine

are given, the Direction may be found:for in the Triangle AX M the SidesA M and A X, and their included An-gle are given, to find the Angle AXM- ythen, the Tangent of the Sum of theAngles AX.M^XAD/l y less by theTangent of the Angle XA M=. theTangent of MAt ? the Elevatipn re-quir’d,

The End of the First Part;

PART