H(arold) L(ocke) Hazen. “Theory of Servo-Mechanisms”, in Journal of the Franklin Institute, September 1934, vol 218 #3, pp 279-331.
And offered with:
“Design and Test of a High Performance Servo-Mechanism”, same volume, though in the November issue (#4), pp 543-580.
Altogether, an 89-page contribution by the PhD from MIT (’31). The EE Hazen is remembered for his contributions and partnership with fellow-MIT associate Vannevar Bush for work on the AC Netowrk Analyzer and tehn more famously for the Differential Analyzer. Very sturdily bound in library cloth. Ex-library, with two scant markings on spine and a university bookplate. VG copy. $250