The purpose of this Technical Reference is to provide standards containing the information necessary to design and manufacture telephones which are compatible with the Bell System telecommunications network and which will provide service capability consistent with Bell System quality of service objectives for telephone service.

This Technical Reference presents criteria which are the minimum necessary to determine if a telephone is technically suitable to be considered for standardization by the American Telephone and Telegraph Co. for use by the Bell Operating Companies. The information in this Technical Reference will be useful to anyone engaged in the manufacture of telephones intended for connection to Bell System facilities and/or equipment and to those purchasing, operating, or using such equipment.

Contributed by Steve Cichorsky. Processed by Remco Enthoven and Paul Fassbender.

Contributed by: JKL Museum

 161 pages.  Principles of transmission engineering presented "in a simple and non-technical way."  Contributed by Steve Cichorsky. 

Contributed by Steve Cichorsky.  OCR by Clint Gilliland.

Contributed by Karl Brose.

Includes articles on the Morris Electronic CO and cord winding.  OCR by Clint Gilliland.

Contributed by Steve Cichorsky.  OCR by Clint Gilliland.

This links to a Library page containing a complete text searchable index that provides access to the full run of BSTJ articles from 1922-1983.  It can be accessed more easily from "Browse the Library" on the black menu bar above.

Contributed by Sam Etler with TCI formatting and site integration by Paul Fassbender.

Contributed by Greg Gobel.  OCR by Karl Brose.

The three wall charts extracted for quick reference from the 1964 Telezonia Teacher's Guide.

"A communications and telephone program for lower elementary grades." Emphasis: language arts, social studies and science.  Uses Teletrainer hardware so students can practice telephone skills. "Role-playing with the Teletrainer stimulates interest in the communications unit, develops listening and speaking skills, and provides opportunities for teaching social studies and science." Contributed by John Novack.

Bell System Technical Reference.  Data Communications using voiceband private line channels. Info for designers and manufacturers of data terminal equipment and voiceband private line channels offered under interstate Tariff F.C.C. No. 260 and similar intrastate tariffs. Contributed by John Gilbert.

Contributed by Steve Cichorsky.  Ocr by Clint Gilliland.

50 pages.  Undated, but certainly before 1955 when C&P of Baltimore City became C&P of Maryland.  Several of the films were made in the late 1920s and can be found on youtube or the AT&T site.  Contributed by John Novack. OCR by Paul Fassbender.

Check out the TCI YouTube channel here.

April 1920. Chicago Telephone Company. Feature article on Machine Switching in the Bell System.  Contributed by Steve Cichorsky. OCR by Clint Gilliland.

Contributed by Steve Cichorsky.  OCR by Clint Gilliland.

Several internal memos discussing transmission and zoning implications of the new 500-type sets.  Includes a mention of the 4,000 unit 1949 trial and projected production quantities for the 500B:  50Q2 - 23K, 50Q3 - 49K and 50Q4 - 49K; and for the 401B: 50Q4 - 20K.  Price for a 500B = $14.30.  Also see AB43.910  Contributed by Clint Gilliland.

Contributed by John Novack.

EDUCATIONAL BULLETIN NO. 2.50
FUNDAMENTALS OF EQUIPMENT ENGINEERING - "This bulletin ls issued to describe the fundamental routines and practices employed by the Equipment Engineer. Informat1on contained herein is to be used for training purposes only."

Includes an exhaustive description of "Information and References Used by Equipment Engineers," such as drawing types, keysheets, standard specifications (J-, K-, KS-, and C-), reference books, etc. For example:

KS SPECIFICATION - Specifications issued by the Bell Telephone Laboratories covering engineering requirements manufactured by outside suppliers.

Specifications in the KS-5000 series are issued to cover engineering requirements which must be met by outside suppliers in connection with equipment wh1ch they furnish to the Western Electric Company. These specifications are used by the Merchandise and Manufacturing Departments for ordering, analyzing and editing purposes and by the Inspection Department for checking Purposes.

Acoustic and Inductive Coupling for Data and Voice Transmission. October 1972.  Shows G- and Trimline handset dimensions.  F-58654 Coupler Test Set.  Contributed by Clint Gilliland. 

Contributed by Steve Cichorsky.