Lincoln Laboratory. Division 6

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Project Whirlwind Limited Memo L-115. Tabulation of visitors to the Digital Computer Laboratory from 1 July 1952 to 30 June 1953, broken down into the following categories: educational institutions, foreign countries, industries, and government departments, bureaus, and agencies.

Scope and Contents MIT DIC 6889. Project Whirlwind Memo M-2602. Metals and ferrites with rectangular hysteresis loops are used in magnetic amplifiers, switching networks, and data-storage systems. In these applications, the large-signal pulse response is most important. To reduce the effect of eddy currents, metals have been rolled to ultra-thin gage and high-resistivity ferrites have been used. By these techniques, eddy currents have been reduced to the point where relaxation effects limit the response time...

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Division 6 Limited Memo 6L-189. Memo making a proposal for the responsibilities of various organizations and outlining how Lincoln Laboratory would accomplish the tasks outlined in Memo 6M-3416. Contains three drawings.

Scope and Contents Division 6 Memo M-4218. A proposed core memory is described that has sequential access to 256 registers (word storage locations), can read out a new word every 3 microsecond and has word length of 58 bits. A read-rewrite cycle for a given storage location requires 6 microseconds; the rewrite (or write), is accomplished during the 3 microsecond period that the next storage location is being read. Direct storage location selection provides a 3-to-1 selection ratio. Small, low-coercive-force...

Scope and Contents MIT DIC 6889. Project Whirlwind Memo 6M-3185. Semicovalence and its effects on indirect magnetic-exchange interaction are reviewed and applied to the manganites. These considerations lead to qualitative predictions which are in complete accord with the following experimentally observed facts, where x is taken as the percentage of manganese ions which are Mn[superscript 4+]: (1) At x = 0, LaMnO₃ is an orthorhombic perovskite-type lattice with a₁ = a₃ > a₂. The ratio a₂/a₃ increases to 1 at...

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Division 6 Memo M-3717. Master's thesis proposal on the topic of a transistor selection system for magnetic-core memory. Includes: statement of the problem, history of the problem, proposed procedure, equipment needed, estimated time, supervision agreement, bibliography, and diagrams.

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Project Whirlwind Memo M-2337. Initial entries in the Circuit Application Manual will be distributed during the third week in August. This note is to familiarize engineers with the contents of the manual.

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Project Whirlwind Memo M-2335. Memorandum on the membership and activities of the basic circuit sub-committee.

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Project Whirlwind Memo M-2352. Memorandum on the agenda for a meeting of the Central Standards Committee on Friday, August 14, at MIT.

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Division 6 Memo M-3307. Minutes of the Air Force joint coordination meeting discussing XD-1 and XD-2 progress; the production engineering aspect of work on the duplex machine; and manufacturing activities. In attendance: C. A. Rice, F. Moore, P. K. Philhower, C. F. Lynch, C. Watt, J. F. Martell, M. R. Zale, R. J. Whalen, Major Zaney, G. Solomon, J. Fraser, F. Paul, D. M. Gallagher, G. Cullen, Major D. H. Vlcek, Lt. F. Harding, Mr. Widmaier, R. V. Baylis.

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MIT DIC 6889. Project Whirlwind Memo M-2412. Neel's molecular field model of ferrimagnetism is reviewed and it is shown how the magnetization below the Curie point can be calculated as a function of temperature using susceptibility data obtained above the Curie temperature. While neither Neel's fundamental concepts nor his conclusions have been altered, his methods have been modified in order to obtain a clearer understanding of his results.

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Project Whirlwind Limited Memo L-142. Summary of the status of the XD-1 program, responsibilities assumed by Division 6, finances, assistance from other Lincoln divisions, and Building F urgency.

Scope and Contents MIT DIC 6889. Project Whirlwind Memo M-2473. A mechanism is proposed whereby a tetragonal 2MOMnO₂ phase is precipitated at {101} surfaces in manganese-rich spinel systems. The critical Mn[superscript +4] content for precipitation is estimated from studies of lattice parameters in the Fe₃O₄-Mn₃O₄-ZnMn₂O₄-ZnFe₂O₄ system. A prediction is then made as to which compositions in the MgO-Fe₃O₄-Mn₃O₄ system will give favorable B-H loops. A large region is found to depend critically upon the firing...

Scope and Contents MIT DIC 6889. Project Whirlwind Memo M-2873. MIT proposes approval of release of IBM engineering specifications No. 3043000, engineering change No. 11183, for the ferrite memory core to facilitate procurement negotiations with General Ceramics Corp. and the development and construction of test equipment. New specifications embodying a simplified test procedure, but not changing the memory-core characteristics, are expected on approximately September 1, 1954. Test-equipment planning should be...

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Project Whirlwind Administrative Memo A-42-6. Biweekly reports to their Group Leaders are to be submitted to all staff members before 3 pm on alternate Fridays. Comments must be concise but convey the scope of the work of the period. Group Leaders, after checking for completeness, classification, sequence, and absence of duplication, will forward reports to Division 6 Publications by 10 am of the Monday following the Friday due date.

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Project Whirlwind Administrative Memo A-42-7. Biweekly copy is due to Publications at noon on alternate Mondays. Organization outline is attached.

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Project Whirlwind Memo M-2427. Bi-weekly progress report of the Group 62 Scheduling Office on the AN/FSQ-7 equipment.

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Project Whirlwind Memo M-2456. Bi-weekly progress report of the Group 62 Scheduling Office on the AN/FSQ-7 equipment.

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Project Whirlwind Memo M-2633. Bi-weekly progress report of the Group 62 Scheduling Office on the AN/FSQ-7 equipment.

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Project Whirlwind Memo M-2676. Bi-weekly progress report of the Group 62 Scheduling Office on the AN/FSQ-7 equipment.

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Project Whirlwind Memo M-2558. Bi-weekly progress report of the Group 62 Scheduling Office on the AN/FSQ-7 equipment.

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Project Whirlwind Memo M-2583. Bi-weekly progress report of the Group 62 Scheduling Office on the AN/FSQ-7 equipment.

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Project Whirlwind Memo M-2511. Bi-weekly progress report of the Group 62 Scheduling Office on the AN/FSQ-7 equipment.

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Project Whirlwind Memo M-2538. Bi-weekly progress report of the Group 62 Scheduling Office on the AN/FSQ-7 equipment.

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Project Whirlwind Memo M-2478. Bi-weekly progress report of the Group 62 Scheduling Office on the AN/FSQ-7 equipment.

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Project Whirlwind Memo M-2322. Bi-weekly progress report of the Group 62 Scheduling Office on the AN/FSQ-7 equipment.

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Project Whirlwind Memo M-2360. Bi-weekly progress report of the Group 62 Scheduling Office on the AN/FSQ-7 equipment.

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Project Whirlwind Memo M-2373. Bi-weekly progress report of the Group 62 Scheduling Office on the AN/FSQ-7 equipment.

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Project Whirlwind Memo M-2411. Bi-weekly progress report of the Group 62 Scheduling Office on the AN/FSQ-7 equipment.

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Project Whirlwind Memo 6M-3742. Points of agreement between IBM and MIT personnel present at a meeting held at IBM for the purpose of discussing FSQ-7 core memory are enumerated. Proposed future development work is described.