David D. Prentiss, AtIantic Oceanographic Laboratory,

Bedford Institute, Dartmouth, Nova Scotia, Canada

This program, developed for a PDP-8 4K machine, requires

the full library of functions. It calculates a seismic refraction

model using the slope-intercept method of M. Ewing, G. P.

Woollard and A. C. Vine proposed in 1939 and the notation

of J. I. Ewing's article on marine seismic refraction and re-

flective methods appearing in Volume III of "The Sea."