Hybrid Coils.

[Palo Alto]: 1925. 8-3/4" x 11". [4], 76 pp, recto only. Red cloth stamped in black, illustrated with 34 blueprint figures (lacking #18 but with two of #17), including 12 full-page and one fold-out figure. Lightly worn, with damp-spotting and darkened spine; missing front endpaper; minor staining from paste to occasional leaves. Signed by Fullerton in ink at the end of the Introduction. Good+.

An interesting student thesis on the practical use of hybrid coils in telephony by Dick P. Fullerton, a Seattle native who worked for Western Electric and would later become president of the New York Telephone Company. Shortly after transfering to the latter company, he assisted Stanley S. N. Watkins in his preparation of the Voder machine for demonstration at the 1939 World's Fair.

The thesis is divided into three parts: "The first is a general discussion of the hybrid coils and their use in telephone work. The second part is a mathematical analysis of the three chief relations in a hybrid coil, and the third part is an experimental verification of these mathematical derivations. ... Through the entire paper I have endeavored to keep the practical application of the coil to the repeater as the chief thought, for the prime function of the coil is to transmit speech, and if it fails in this, it is useless, regardless of the results of experiments and mathematics" (pp [2-3]).

Scarce. We find one holding in OCLC, at Stanford.