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 43feb BLR P168 Operator Ad Popular

By 440 downloads

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43feb_BLR_p168_Operator_Ad.pdf

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 43jan BLR P113 Telephone Booth Popular

By 492 downloads

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43jan_BLR_p113_Telephone_Booth.pdf

43jan BLR P113 Telephone Booth

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 43nov BLR P115 - Steel Handset Parts Popular

By 447 downloads

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43nov_BLR_p115_Steel_Handset_Parts.pdf

43nov BLR P115 - Steel Handset Parts

WWII. Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 44apr BLR P371 Noisy Locations Telephone Popular

By 434 downloads

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44apr_BLR_p371_Noisy_Locations_Telephone.pdf

44apr BLR P371 Noisy Locations Telephone

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 44aug BLR P491 Material Replacements Popular

By 459 downloads

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44aug_BLR_p491_Material_Replacements.pdf

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 44jan BLR P214 Substitute Materials Booths Popular

By 546 downloads

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44jan_BLR_p214_Substitute_Materials_Booths.pdf

44jan BLR P214 Substitute Materials Booths

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 44jul BLR P476 Coin Shelves Popular

By 516 downloads

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44jul_BLR_p476_Coin_Shelves.pdf

44jul BLR P476 Coin Shelves

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 47oct BLR P375 81A Toner Popular

By 579 downloads

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47oct_BLR_p375_81A_Toner.pdf

47oct BLR P375 81A Toner

Shown in transparent case. Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 49Apr BLR P125 555 PBX Popular

By 924 downloads

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49Apr_BLR_p125_555_PBX.pdf

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 49Jan BLR P43 Color 300 Series Sets Popular

By 581 downloads

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49Jan_BLR_p43_Color_300_Series_Sets.pdf

49Jan BLR P43 Color 300 Series Sets

Bell Labs Record.  Colored Telephone Sets. Announces resumed (after WWII) production of colored, molded plastic 300-type sets in ivory (first), followed by old rose, gray-green, dark blue and Pekin red.  Metallic colors to be applied in WE distributing house shops. Contributed by Chuck Hensley. 

pdf 49May BLR P165 New 500 Popular

By 468 downloads

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49May_BLR_p165_New_500.pdf

49May BLR P165 New 500

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 50Feb BLR Cover 500Set Popular

By 449 downloads

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50Feb_BLR_cover_500_Set_tci.pdf

50Feb BLR Cover 500Set

Photo shows early number plate format. Contributed by Chuck Hensley.

pdf 50jan BLR Vol XXVIII No. 1 Popular

By 552 downloads

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50jan_BLR_Vol.XXVIII_No_1_tci.pdf

50jan BLR Vol XXVIII No. 1

Contributed by Chuck Hensley.

Contents:
   VIBRATING REED SELECTORS FOR MOBILE TELEPHONE SYSTEMS
   THE ORIGINAL DIAL PULSE REGISTER CIRCUIT FOR THE CROSSBAR SYSTEM NO. 5
   THE CASE OF THE BARNACLED CRYSTAL
   MURRAY HILL AUDITORIUM AS A LISTENING ROOM
   BELL LABORATORIES SERVED BY WESTERN'S NEW TELETYPEWRITER SWITCHING NETWORK
   EQUIPMENT FEATURES OF THE CABLE CARRIER SYSTEM

pdf 50May BLR Cover Drop Test Popular

By 508 downloads

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50May_BLR_cover_Drop_Test.pdf

50May BLR Cover Drop Test

Bell Labs Record.  Contributed by Chuck Hensley.

pdf 51Dec BLR P545 Adjusting C Ringer Popular

By 465 downloads

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51Dec_BLR_p545_Adjusting_C_Ringer.pdf

51Dec BLR P545 Adjusting C Ringer

Contributed by Chuck Hensley.

pdf 51Jan BLR P32 WECo Indianapolis Popular

By 688 downloads

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51Jan_BLR_p32_WECo_Indianapolis.pdf

Contributed by Chuck Hensley.

pdf 51Mar BLR P115 - W-R-J-M Popular

By 911 downloads

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51Mar_BLR_P115_W-R-J-M_ocr.pdf

51Mar BLR P115 - W-R-J-M

WRJM - Standardized letters for party lines with two- and four-party service. Adopted on Oct. 28, 1912. [JMRW] Bell Laboratories Record.  Contributed by Chuck Hensley.

pdf 51Nov BLR P511 500 Transmission 425A Network Popular

By 476 downloads

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51Nov_BLR_p511_500_Transmission_425A_Network.pdf

51Nov BLR P511 500 Transmission 425A Network

Contributed by Chuck Hensley.

pdf 51Oct BLR P460 740E PBX Popular

By 654 downloads

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51Oct_BLR_P460_740E_PBX_2.pdf

51Oct BLR P460 740E PBX

Bell Labs Record.  Contributed by Chuck Hensley.

pdf 51Oct BLR P471 500 Ringer C-type Popular

By 504 downloads

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51Oct_BLR_p471_500_Ringer_C-type.pdf

51Oct BLR P471 500 Ringer C-type

Contributed by Chuck Hensley.

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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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