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 32sep BLR P15 Navy Dial Popular

587 downloads

Download (pdf, 395 KB)

32sep_BLR_p15_Navy_Dial.pdf

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 33apr BLR P244 15A and 23A Key Equipments, Residential, & E Handset Mounting Popular

609 downloads

Download (pdf, 436 KB)

33apr_BLR_p244_15A_23A_Key_Equip_Residental_E_Handset_Mounting.pdf

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 33jul BLR P330 Dial Stroboscope Popular

566 downloads

Download (pdf, 1.04 MB)

33jul_BLR_p330_Dial_Stroboscope_tci_ocr.pdf

33jul BLR P330 Dial Stroboscope

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 34jan BLR P160 Early Bells Popular

667 downloads

Download (pdf, 159 KB)

34jan_BLR_p160_Early_Bells.pdf

34jan BLR P160 Early Bells

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 34jul BLR P322 - Early Handsets Popular

870 downloads

Download (pdf, 973 KB)

34jul_BLR_p322_Early_Handsets.pdf

34jul BLR P322 - Early Handsets

Bell Labs Record. By H. A. FREDERICK, Transmission Instruments Director. Contributed by Chuck Hensley. 

pdf 34jul BLR P343 Jacks and Plugs for Portable Telephones Popular

647 downloads

Download (pdf, 1.16 MB)

34jul_BLR_p343_Portable_Telephones.pdf

34jul BLR P343 Jacks and Plugs for Portable Telephones

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 34jun BLR P297 Telephone Explosive Atmosphere Popular

519 downloads

Download (pdf, 1.15 MB)

34jun_BLR_p297_Telephone_Explosive_Atmosphere.pdf

34jun BLR P297 Telephone Explosive Atmosphere

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 34sep BLR P25 Switchboard Cord Popular

657 downloads

Download (pdf, 1014 KB)

34sep_BLR_p25_Switchboard_Cord.pdf

34sep BLR P25 Switchboard Cord

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 35may BLR P265 Outdoor Telephone 300 Type Popular

655 downloads

Download (pdf, 592 KB)

35may_BLR_p265_Outdoor_Telephone_300_Type.pdf

35may BLR P265 Outdoor Telephone 300 Type

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 35nov BLR P81 Flat Inside Wire Popular

583 downloads

Download (pdf, 169 KB)

35nov_BLR_p81_Flat_Inside_Wire.pdf

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 36aug BLR P381 Artificial Mouth Popular

591 downloads

Download (pdf, 155 KB)

36aug_BLR_p381_Artificial_Mouth.pdf

36aug BLR P381 Artificial Mouth

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 36aug BLR P399 Station Protector Popular

572 downloads

Download (pdf, 242 KB)

36aug_BLR_p399_Station_Protector.pdf

36aug BLR P399 Station Protector

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 36dec BLR P111 Selective Ringing Popular

739 downloads

Download (pdf, 1.06 MB)

36dec_BLR_p111_Selective_Ringing.pdf

36dec BLR P111 Selective Ringing

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 36jul BLR P359 300 Set Trial Popular

773 downloads

Download (pdf, 140 KB)

36jul_BLR_p359_300_Set_Trial.pdf

36jul BLR P359 300 Set Trial

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 36may BLR P297 Larger Telephone Booth Popular

598 downloads

Download (pdf, 323 KB)

36may_BLR_p297_Larger_Telephone_Booth.pdf

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 36may BLR P312 Telephone - Conference Aid Popular

620 downloads

Download (pdf, 1.52 MB)

36may_BLR_p312_Telephone_Conference.pdf

36may BLR P312 Telephone - Conference Aid

100-type loud speaker set, 1933, monitor speaker (early "Spokesman").  Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 36sep BLR P21 Hand Tools Popular

661 downloads

Download (pdf, 727 KB)

36sep_BLR_p21_Hand_Tools.pdf

36sep BLR P21 Hand Tools

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 37aug BLR P370 101-type Key Equipments Popular

712 downloads

Download (pdf, 1.74 MB)

37aug_BLR_p370_101_Key.pdf

37aug BLR P370 101-type Key Equipments

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 37feb BLR P190 Ringer Remagnitizer Popular

691 downloads

Download (pdf, 1003 KB)

37feb_BLR_p190_Ringer_Remagnitizer.pdf

37feb BLR P190 Ringer Remagnitizer

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 38apr BLR P282 Magnetic Telephone Popular

591 downloads

Download (pdf, 495 KB)

38apr_BLR_p282_Magnetic_Telephone.pdf

38apr BLR P282 Magnetic Telephone

Bell Labs Record.  Contributed by Chuck Hensley. 

New User?

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.

Please send a file to add your name to this list!

30 Latest Additions

Who's online

We have 1280 guests online

Hints for using the TCI Library

"Menu Bar" for site navigation.
Many menu choices are hidden until you mouse over words in the black Menu Bar (above).  If you want help getting started, see the links under the word "Introduction" in the Menu Bar.
 
The user interface is oriented toward the user’s choice to either Browse or Search for information.  The Browse the Library menu entry offers many quick links to move around the Library quickly.  Try it!

Three search options.
The Library’s keyword-based searches, called Basic Search and Advanced Search, accept keywords as short as 2 characters (WE, AE, etc.) and search strings up to 255 characters.  If you get more than 1,000 items, refine your search or try the Google Search option.
 
When selected from the Menu Bar, Google only searches for files in the TCI Library.
 
Library INBOX.
The INBOX may hold some files that have been submitted but not fully processed into the Library.  These are often topics of current discussion on the TCI Email Group. Items in the INBOX are not found using Basic or advanced searches, but ARE found by a Google Search.
 
Remember to check the INBOX if you don't find something with the other searches.
 
Finding BSPs.
Many BSPs are currently only identified by BSP number. If a text search doesn’t produce a BSP, try looking in one of the many BSP index documents to find a BSP number for the product you are researching just as you would do if referencing a paper library of the BSPs. Then enter the BSP number in the search box.
 
Finding CDs and SDs.
Some related CDs and SDs are filed in different areas. Try searching for just the numeric portion of the name.  Remember to check the INBOX if you don't find something with the Basic or Advanced searches -- or use the Google search.
 
Compact Category Listing.
When browsing, to change the category listing view from normal to compact, click on Browse the Library in the black menu bar.
 
To change from compact to normal view, click on Document Repository in the drop down under Browse the Library.