Viewing page 337 of 504

This transcription has been completed. Contact us with corrections.

[[right corner]] 144) [[/right corner]]

[[image on the right = drawing of ellipsis representing Earth, with letters representing N-North, E-East, S- South, W- West, marking of a meridian, F&f two foci, degrees of meridian L, A, IK, A, I given latitude]] 
 

[[left margin]] Ellipsis divided into Degrees. See p. 7. a curious Quest. on this subject. [[/left margin]]

Let NESW be an ellipsis, representing a meridian of the earth, according to M. [[underline]] Cassini, [[/underline]] where N is the north pole, S the South pole, F & f the two foci. It is supposed to revolve upon its longer axis. N S & generate a spheroid. 
     Let it berequired to divide this ellipsis or meridian into degrees, [[strikethrough]] for an [[/strikethrough]] as LA, IK, for any given latitude A, I. 

     From the focus F draw an indefinite line FB, making