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Proceedings of the International Conference on Scientific Information Two Volumes (1959) / Chapter Skim
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Retrieval Questions from the Use of Linde's Indexing and Retrieval System
Pages 763-770

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From page 763...
... at Bakelite Development Labora, FRED R WHALEY Technical Literature Coordinator, Tonawanda Research Laboratory, Linde Company, Division of Union Carbide Corporation, Tonawanda, New York.
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From page 764...
... A term number defines a primary class of documents and is symbolized by a capital letter in the logical expressions shown below. Certain logical operations can be performed on these primary classes, and the result of each operation is a new derived class of documents.
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From page 765...
... , although order of operations may affect the time required to obtain the answer. Il- an inquiry involves logical alternation, the plus sign indicates the operation, and it is translated "and/or." Thus if a question involves either class A or B
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From page 766...
... or catalytic uses Preparation of a chemical not using a Grignard reagent 2 0.7 The reaction oftwo chemicals where a third chemical is definitely not formed simple conjunctions, many more matchings are needed, sometimes numbered in the hundreds for a single question. The expanded expression for these types requiring many conjunctions is the only way they can be implemented by some retrieval systems, such as Taube's "Uniterm" (6)
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From page 767...
... We make use of a role code appended to our term number to mean that the item emphasizes the absence of a particular term. This device cuts down on the frequency of logical negation in analyzing questions.
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From page 768...
... If two classes are connected by a minus sign, the class following the minus sign must be a part of the class preceding the minus sign. The minus sign simply means rejecting from a deck of carcis that portion which matches another deck.
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From page 769...
... We do not employ some of the refinements in logical analysis required for the major problem of information retrieval in the world's technical literature. For a medium-sizect document center such as ours dealing primarily with company reports and limited by relatively inexpensive machinery, the logic we employ appears to be quite adequate.
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Key Terms

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  • multiplication sign
  • carbide corporation
  • linde company
  • union carbide

  • formal logic
  • logical analysis
  • particular term
  • deep index
  • aluminum tubing

  • aluminum flange
  • matched cards
  • described herein
  • simply means
  • problemy dokumentatsii

  • means rejecting
  • usually expressed
  • company reports
  • quantitative distribution
  • single class


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