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Folder BLR

See Chuck Hensley's comprehensive index to articles in the BLR in the folder below.  It can be used to locate articles to research, whether found in the TCI LIbrary or elsewhere.

Chuck has offered to scan a limited number of pages from his collection (at his convenience).  Send requests using the "Contact Us" link in the Menu Bar above.

HINT:  Search for "BLR" followed by a topic keyword to find a series of related articles.  Use alphabetic sort to display them in chronological order.  e.g.  BLR PBX  or  BLR Picturephone.

When posted, complete scanned BLR issues from Sept. 1925 - Dec. 1961 were available here:
  https://worldradiohistory.com/Bell_Laboratories_Record_Issue_Key.htm

Categories

Folder BLR Collections

Folder BLR Index

Documents

pdf 74sep BLR P238 - Modular Set Introduction Popular

1378 downloads

Download (pdf, 7.71 MB)

74sep_BLR_P238_Modular_Set_Intro_r_tci_ocr.pdf

74sep BLR P238 - Modular Set Introduction

8MB.  Bell Labs Record, Sep 74, Pages 238-244 plus covers in color. Formatted for viewing (2 pages per pdf page). "Telephone Sets Go Mod (Modular, That Is)"  Modular Wiring. Contributed by Steve Cichorsky.

pdf 65jun BLR - No. 1 ESS - [1] pp 194-213 [LARGE FILE] Popular

920 downloads

Download (pdf, 26.35 MB)

No. 1 ESS Section I.pdf

65jun BLR - No. 1 ESS - [1] pp 194-213 [LARGE FILE]

June 1965 Bell Labs Record (BLR) special Issue includes: Evolution of Telephone Switching, From Morris to Succassuna, The Stored Program, The Control Unit, Memory Devices, The Switching Network, Mechanical Design, Testing The System, Cutover, etc.   -- In four downloads, part 1. 1ESS.

pdf 65jun BLR - No. 1 ESS - [2] pp 214-235 [LARGE FILE] Popular

699 downloads

Download (pdf, 27.14 MB)

No. 1 ESS Section II.pdf

65jun BLR - No. 1 ESS - [2] pp 214-235 [LARGE FILE]

1ESS Part 2 of 4.

pdf 65jun BLR - No. 1 ESS - [3] pp 236-261 [LARGE FILE] Popular

631 downloads

Download (pdf, 28.52 MB)

No 1 ESS Section III.pdf

65jun BLR - No. 1 ESS - [3] pp 236-261 [LARGE FILE]

1ESS Part 3 of 4.

pdf 65jun BLR - No. 1 ESS - [4] pp 262-281 [LARGE FILE] Popular

690 downloads

Download (pdf, 17.75 MB)

No 1 ESS Section IV.pdf

65jun BLR - No. 1 ESS - [4] pp 262-281 [LARGE FILE]

1ESS Part 4 of 4.

pdf 66jan BLR - Trimline Development Popular

893 downloads

Download (pdf, 7.44 MB)

Trimline Development.pdf

66jan BLR - Trimline Development

Jan 66, Bell Labs Record, pp 8-14. "The Evolution Of A Telephone,"   Great photo evolution chart showing prototypes on page 10 and info on field trials.

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Read the articles under "Introduction" in the black menu bar above.

Recent Contributors

Thanks for new documents from Ed Palazzo, Bruce Patterson, Jon Kolger, Paul Ivester, Len Hicken, Paul Fassbender, Fred Haynes, Kurt Rudolph, Wade ("Kellogg KITT"), the Connections Museum, Rick Walsh, Jeff Lamb, Jeremy Walters, Mark Cuccia, Alan David, Harry Joseph, Charlie Terry, Karl Brose, Dennis Hock, Tim Griffin, Remco Enthoven, and Steve Cichorsky.

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