Buck, Dudley Allen, 1927-1959

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...

Scope and Contents

MIT DIC 6889. Project Whirlwind Engineering Note E-454. A non-destructive read system for magnetic cores is proposed which involves a quadrature field and which promises to be fast.

Scope and Contents

MIT DIC 6889. Project Whirlwind Memo M-1929. The undersigned continued the discussion on FeNi₃ initiated by Dudley Buck at the seminar on magnetism, the meaning of order-disorder and entropy were examined. Hysteresis loops, saturation magnetization and Curie point of ordered and disordered states were contrasted and their differences tentatively explained.

Scope and Contents

MIT DIC 6345. Project Whirlwind Memo M-1335. Master's Thesis Proposal: An Investigation of Ferroelectrics for Digital Information Storage.

Scope and Contents

MIT DIC 6345. Project Whirlwind Engineering Note E-438. Magnetic materials suitable for multi-dimensional memories have recently become candidates for circuit elements in other parts of a digital computer. Their possible uses in binary counters and as pulse-operated gates are being considered.

Scope and Contents Project Whirlwind Report R-212. This report was originally issued as a thesis report and as such received but limited distribution. So as to extend the distribution to the many who have expressed interest in ferroelectric components for digital information storage and switching, this report is now issued as an M. I. T. Digital Computer Laboratory R-series report. The author is indebted to Professor Arthur R. von Hippel, Director of the M. I. T. Laboratory for Insulation Research; to...

Scope and Contents

Project Whirlwind Engineering Note E-504. This memorandum contains the abstract of Report R-212, a Master's Thesis, by Dudley A. Buck.

Scope and Contents

MIT DIC 6889. Project Whirlwind Memo M-2167. Aside from all second-order effects, there is an unwanted output voltage inherent in magnetic-memory arrays due to cores whose half-selected output voltages do not cancel. This voltage is due to two cores in the arrays presently in use but can be due to three or four cores in other rectangular arrays.

Scope and Contents

MIT DIC 6889. Project Whirlwind Memo M-1934. This memo is a summary of a Group 63 seminar on magnetism. Topics include the Hartree and Hartree-Fock methods of arriving at a self-consistent field determination.

Scope and Contents

MIT DIC 6889. Project Whirlwind Engineering Note E-477. This paper was prepared at the request of Professor Arthur R. von Hippel for presentation at a summer symposium on the Theory and Applications of Dielectric Materials, September 3-12, 1952, at the Massachusetts Institute of Technology.

Scope and Contents

MIT DIC 6889. Project Whirlwind Memo M-1381. The following analysis of a magnetic-core memory shows the extent to which the quiescent internal impedance of the row and column drivers affects the selection ratio.

Scope and Contents of the Collection The Forrester patent litigation extended over many years and resulted in a voluminous set of records. The records represent the documentation assembled and produced by MIT and the law firm of Kenway & Jenney in the course of the suits.The collection fully documents the development of magnetic core memory and MIT's involvement in the patent litigation cases. It also provides information concerning the administrative handling of a major university patent and the relationship...

Scope and Contents MIT DIC 6889. Project Whirlwind Engineering Note E-529. Modification of the driving scheme during either the READ or the WRITE part of the READ-WRITE cycle would allow unidirectional current pulses in the rows and columns of a magnetic-matrix memory. This modification involves driving of all but the selected row and column during the modified part of the cycle. It requires additional low-level switching equipment and much larger total driving current, but with a tube-driven array, it...

Scope and Contents MIT DIC 6889. Project Whirlwind Engineering Note E-454-1. A "Nondestructive" method for sensing the information state of magnetic-memory cores is under development. This new method involves the use of a quadrature magnetic field which, when pulsed, produces an output voltage. The polarity of the output voltage contains the information—a positive output pulse represents a ONE, and a negative pulse a ZERO. Reading in this manner can be repeated indefinately without destroying the information...

Scope and Contents

Project Whirlwind Memo M-1376. Report No. 1. Progress Report to the Department Committee on Graduate Study and Research on an Investigation of Ferroelectrics for Digital Information Storage.

Scope and Contents

Project Whirlwind Memo M-1450. Report No. 2. Progress Report to the Department Committee on Graduate Study and Research on an Investigation of Ferroelectrics for Digital Information Storage.

Scope and Contents

MIT DIC 6345. Project Whirlwind Administrative Memo M-1108. Memorandum from project Whirlwind research teams on control of the special display for electronic digital computers.

Scope and Contents Division 6 Memo M-3843. Tne study of nonlinearities in nature suitable for computer use has led to the cryotron, a device based on the destruction of superconductivity by a magnetic field. The cryotron, in its simplest form, consists of a straight piece of wire about one inch long with a single-layer control winding wound over it. Current in the control winding creates a magnetic field which causes the central wire to change from its superconducting state to its normal state. The device has...

Scope and Contents

Project Whirlwind Engineering Note E-460. A multi-position ferroelectric switch is proposed which can accomplish many of the switching tasks in an information handling system; in particular, it can select among rods and columns of a ferroelectric memory. The logical circuitry of the ferroelectric switch can be painted directly onto the two sides of a thin ferroelectric sheet.

Scope and Contents MIT DIC 6889. Project Whirlwind Memo M-1557. A trip was made at the conclusion of the thesis work on ferroelectrics for digital information storage and switching to compare progress and to exchange ideas with other researchers in this field. In addition, one visit was made to a cryogenics laboratory to obtain an opinion as to the feasibility of the magnetoresistive gate. During these visits, contact was made with workers in other fields which are of interest to this laboratory. The following...

Scope and Contents

MIT DIC 6889. Project Whirlwind Memo M-2778. A trip was made to various laboratories investigating ferroelectric and ferromagnetic materials for information storage and switching. Information is listed by topics.

Scope and Contents

MIT DIC 6889. Project Whirlwind Memo M-2843. A trip was made to the Burroughs Research Center to discuss magnetic-core computer components and fabrication of metal cores. They are planning to make and improve metal cores and they have used magnetic cores in logical switching applications.

Scope and Contents

MIT DIC 6889. Project Whirlwind Memo M-2398. The Linde Corporation is growing ferrite single crystals by the Verneuil process. They are of interest to this laboratory for basic studies of the switching mechanism of ferrites.

Scope and Contents

MIT DIC 6889. Project Whirlwind Memo M-1705. On October 28, 1952, D. R. Brown, P. K. Baltzer and D. A. Buck of this laboratory visited the Bell Telephone Laboratories at Murray Hill, New Jersey, to discuss magnetic materials research with the following Bell men: R. M. Bozorth, H. J. Williams, M. Goertz, J. K. Galt, F. J. Schnettler, V. E. Legg, J. R. Anderson, S. O. Morgan, J. H. Scaff.

Scope and Contents Project Whirlwind Memo M-2332. A recent trip to the West Coast included visits to several laboratories engaged in the development of magnetic materials for digital-computer applications. Evaporated molybdenum Permalloy cores at NBS, Corona, have rectangular hysteresis loops but high coercivities. At UCLA, lithium ferrite is being investigated for memory-core applications by a group under the supervision of Prof. W. D. Hershberger; usable materials have been obtained. An investigation of the...