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

Documents

pdf 63Aug BLR P273 Trimline Ending Dial In Handset Trials Popular

By 446 downloads

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63Aug_BLR_P273_Trimline_Ending_Dial_in_Handset_Trials.pdf

63Aug BLR P273 Trimline Ending Dial In Handset Trials

"Trimline II" field trial in Michigan. Bell Laboratories Record. Contributed by Chuck Hensley.

pdf 63Jan BLR P12 PBX Range Charts Popular

By 459 downloads

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63Jan_BLR_P12_PBX_Range_Charts.pdf

Bell Laboratories Record. Contributed by Chuck Hensley.

pdf 63Jan BLR P2 FM Data Set Popular

By 402 downloads

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63Jan_BLR_P2_FM_Data_Set.pdf

63Jan BLR P2 FM Data Set

Bell Laboratories Record. Contributed by Chuck Hensley.

pdf 63Jun BLR P218 Home Interphone Popular

By 463 downloads

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63Jun_BLR_P218_Home_Interphone.pdf

63Jun BLR P218 Home Interphone

Bell Laboratories Record. Contributed by Chuck Hensley.

pdf 63Jun BLR P237 PBX Consoles Popular

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63Jun_BLR_P237_PBX_Consoles.pdf

63Jun BLR P237 PBX Consoles

Bell Laboratories Record. Contributed by Chuck Hensley.

pdf 63Nov BLR P374 101ESS Popular

By 476 downloads

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63Nov_BLR_P374_101ESS.pdf

63Nov BLR P374 101ESS

Bell Laboratories Record.  Contributed by Chuck Hensley.

pdf 63Oct BLR P354 Testing TouchTone Set Popular

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63Oct_BLR_P354_Testing_TouchTone_Set.pdf

63Oct BLR P354 Testing TouchTone Set

Bell Laboratories Record. Contributed by Chuck Hensley.

pdf 64Apr BLR P114 PICTUREPHONE Service Experiments Popular

By 487 downloads

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64Apr_BLR_P114_PICTUREPHONE_Service_Experiments.pdf

64Apr BLR P114 PICTUREPHONE Service Experiments

Bell Labs Record. Contributed by Chuck Hensley.

pdf 64Aug BLR P247 761A PBX Small Hotel Motel Popular

By 504 downloads

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64Aug_BLR_P247_761A_PBX_Small_Hotel_Motel.pdf

64Aug BLR P247 761A PBX Small Hotel Motel

Bell Laboratories Record. Contributed by Chuck Hensley.

pdf 64May BLR P159 Handsets With Amplifiers G6 G7 G8 Popular

By 435 downloads

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64May_BLR_P159_Handsets_With_Amplifiers_G6_G7_G8.pdf

64May BLR P159 Handsets With Amplifiers G6 G7 G8

Bell Laboratories Record. Contributed by Chuck Hensley.

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

By 945 downloads

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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

By 720 downloads

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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

By 656 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

By 712 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 65Nov BLR P395 Designing Telephone Ringers Popular

By 715 downloads

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65Nov_BLR_P395_Designing_Telephone_Ringers.pdf

65Nov BLR P395 Designing Telephone Ringers

Bell Laboratories Record. Contributed by Chuck Hensley.

pdf 65Sep BLR P344 Trimline Introduction Popular

By 427 downloads

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65Sep_BLR_P344_Trimline_Introduction.pdf

Bell Laboratories Record. Contributed by Chuck Hensley.

pdf 66jan BLR - Trimline Development Popular

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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.

pdf 66Jan BLR P16 New Coin Look Popular

By 389 downloads

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66Jan_BLR_P16_New_Coin_Look.pdf

66Jan BLR P16 New Coin Look

Bell Laboratories Record. Contributed by Chuck Hensley.

pdf 66Jan BLR P20 Single Slot Payphone Popular

By 1003 downloads

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66Jan_BLR_P20_Single_Slot_Payphone.pdf

66Jan BLR P20 Single Slot Payphone

Bell Laboratories Record. Contributed by Chuck Hensley.

pdf 66Jan BLR P24 CALL A MATIC Popular

By 476 downloads

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66Jan_BLR_P24_CALL_A_MATIC.pdf

66Jan BLR P24 CALL A MATIC

Call-a-matic Dialer. Bell Laboratories Record. Contributed by Chuck Hensley.

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Thanks for new documents from Jim Hurtle, Ed Palazzo, Paul Fassbender, Bruce Patterson, Remco Enthoven, Jon Kolger, Paul Ivester, Len Hicken, Fred Haynes, Kurt Rudolph, Wade ("Kellogg KITT"), the Connections Museum, Rick Walsh, Jeff Lamb, Jeremy Walters, Alan David, Dennis Hock, and Tim Griffin.

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