Abstract to "A thesis submitted to the faculty of Purdue University fo Gary Marshall Richetto in partial fulfillment of the requirements for the degree of Doctor of Philosophy, January 1969".; Handwritten note on front page: Return to Internal Communication, Room 223, 4202.
This is a Comment Edition of Historical Note No. 53 prepared by a summer employee of the NASA Historical Staff (APPH). The author has agreed to integrate comments and corrections submitted by critical readers, a normal process of validation for all historical reports and studies.