The 2nd Edition contains a lot of new material, including 60 new figures, making it a significantly bigger book. It now covers Automatic Electric telephones, which were not covered in the 1st edition, and the 2nd edition also includes many enhancements of the earlier material plus a couple of corrections. The following list (Reasons #1-131) identifies new material that was not present in the 1st edition.
#1-21 Twenty-one Automatic Electric telephones and boxes with photographs and descriptions
22-24 Three additional Western Electric telephones with photographs and descriptions
25-30 Descriptions of Princess-type and Trimline-type phones made by Kellogg, S-C, and AE
31-32 Two additional S-C wall phones with touchtone instead of rotary dial and vice versa
33-38 Six new diagrams, with descriptions, that show how nonpositional transmitters work
39-40 George Eaton’s patent and his article on transmitter design that shaped the future
41-44 Electrical properties of four AE receivers
45 Re-measured ringer properties (and added phase angles) using precision instruments
46 Match-book-size ring generator that will work off of two lantern batteries
47 Enhanced discussion of frequency ringers (harmonic, synchromonic, and decimonic)
48 Western Electric A, B, and D-type desk stands correctly identified -- no more AA1
49 Describes function of hinged plate in cradle of S-C 1200-type desk phones
50 Corrects error in definition of Ringer Equivalence Number (REN)
51-60 REN measurements for ten popular telephone types that pre-date FCC requirements
Describes revision of FCC Part 68 regulations that created a new industry standard
62 Describes change in FCC Part 68 regulation regarding who may repair telephones
63 Describes change in new industry standard in definition of grandfathered telephones
64 Describes Cat. 5 and Cat. 3 cables, and new FCC Part 68 regulation on household cables
65 Gives ATCA and TCI web sites as starting point for locating parts
66 More color coding for cables up to four pairs
67 More information on removing dial finger wheels
68 Modern equivalent of Western Electric process for wood finish on wall phones
69 Mentions manufacturers’ names for plastic cleaners and polishes
70 Photo showing hidden retaining screw on AE jukebox phones
71 Photo showing how to adjust the elephant ear on early AE Monophone handsets
72 Purpose of transmitter condenser in E1 and F1 handsets (and why not needed in others)
73 Why a 4-conductor handset cord is used in 500-type and later phones (only 3 earlier)
74 Great new intercom hookup for slightly modified 500-type phones
75 Corrects error in Appendix on impedance matching with induction coils
76-93 Electrical properties of 18 AE induction coils
94-112 Nineteen AE circuit diagrams including induction-coil receiver, manually adjusted Type 80
113 Three variations of the AE mini circuit from the Styleline phone
114 Circuit for the WE 331B portable phone with printed circuit board
115 Discusses Kellogg’s Triad as a bridge-type circuit with new measurements and diagrams
116 Circuit for converting common-battery phones for local-battery operation
117 Delayed patent for Booster circuit, found after a long search
118 Explains the letter “Z” on one terminal of old Western Electric receivers
119-128 Ten important new references in the bibliography
129 Improved index
130 Price guide in back of book with convenient pictures
131 Larger photos and diagrams with better resolution of details