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 27jan BLR P155 Accelerated Testing Popular

1357 downloads

Download (pdf, 923 KB)

27jan_BLR_p155_Accelerated_Testing.pdf

27jan BLR P155 Accelerated Testing

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 28aug BLR P399 740A PBX Popular

2025 downloads

Download (pdf, 820 KB)

28aug_BLR_p399_740A_PBX.pdf

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 28oct BLR P44 Dialing Errors Popular

1380 downloads

Download (pdf, 474 KB)

28oct_BLR_p44_Dialing_Errors.pdf

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 29dec BLR P162 Lacquering Plating Popular

1432 downloads

Download (pdf, 908 KB)

29dec_BLR_p162_Lacquering_Plating.pdf

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 29jan BLR P203 Operator Headset Popular

1950 downloads

Download (pdf, 824 KB)

29jan_BLR_p203_Operator_Headset.pdf

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 29nov BLR P113 Telephone Ringing Popular

1581 downloads

Download (pdf, 1.16 MB)

29nov_BLR_p113_Telephone_Ringing.pdf

29nov BLR P113 Telephone Ringing

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 29oct BLR P73 Toll Calls Popular

1683 downloads

Download (pdf, 778 KB)

29oct_BLR_p73_Toll_Calls.pdf

29oct BLR P73 Toll Calls

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 30aug BLR P586 Apparatus Springs Popular

1305 downloads

Download (pdf, 703 KB)

30aug_BLR_p586_Apparatus_Springs.pdf

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 30dec BLR P175 Apparatus Finishes Popular

1588 downloads

Download (pdf, 812 KB)

30dec_BLR_p175_Apparatus_Finishes.pdf

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 30jun BLR P418 Die Casting Popular

665 downloads

Download (pdf, 838 KB)

30jun_BLR_p418_Die_Casting.pdf

30jun BLR P418 Die Casting

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 30may BLR P416 Residence PBX - 740-C Popular

781 downloads

Download (pdf, 1007 KB)

30may_BLR_p416_Residence_PBX.pdf

Bell Labs Record.  740C PBX.  Contributed by Chuck Hensley. 

pdf 30may BLR P421 Telephone Booth Popular

854 downloads

Download (pdf, 724 KB)

30may_BLR_p421_Telephone_Booth.pdf

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 31jun BLR P470 Insulating Material Popular

686 downloads

Download (pdf, 1.04 MB)

31jun_BLR_p470_Insulating_Material.pdf

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 31may BLR P426 Wear Test Popular

583 downloads

Download (pdf, 1.16 MB)

31may_BLR_p426_Wear_Test.pdf

31may BLR P426 Wear Test

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 31oct BLR P46 Hard of Hearing Popular

583 downloads

Download (pdf, 492 KB)

31oct_BLR_p46_Hard_Hearing.pdf

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 32apr BLR P275 Condenser Popular

604 downloads

Download (pdf, 684 KB)

32apr_BLR_p275_Condenser.pdf

32apr BLR P275 Condenser

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 32aug BLR P421 Inside Wire Popular

610 downloads

Download (pdf, 557 KB)

32aug_BLR_p421_Inside_Wire.pdf

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 32feb BLR P182 Operator Transmitter Popular

577 downloads

Download (pdf, 863 KB)

32feb_BLR_p182_Operator_Transmitter.pdf

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 32jul BLR P385 Station Ringer Popular

618 downloads

Download (pdf, 669 KB)

32jul_BLR_p385_Station_Ringer.pdf

32jul BLR P385 Station Ringer

Bell Labs Record.  Contributed by Chuck Hensley. 

pdf 32nov BLR P80 Prorector Block Popular

616 downloads

Download (pdf, 862 KB)

32nov_BLR_p80_Prorector_Block.pdf

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!

Who's online

We have 974 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.