H. B. Brooks

RCA (United States)

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Co-Authors

F. M. Defandorf

National Institute of Standards and Technology

F.C. Holtz

IIT Research Institute

Ken Walker

Infrared Laboratories (United States)

F. C. Weaver

F.W. Glading

State Street (United States)

Hugh L. Dryden

National Aeronautics and Space Administration

Whitney Canada

State Street (United States)

Burton McCollum

United States Government Publishing Office

F. B. Silsbee

National Institute of Standards

E. B. Rosa

Universidad de Los Lagos

Cooperative Institutions

National Institute of Standards and Technology

State Street (United States)

United States Department of Commerce

National Institute of Standards

Infrared Laboratories (United States)

General Dynamics (United States)

National Aeronautics and Space Administration

Sorbonne Université

Trinity College

Springer Nature (Germany)

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Treasure of the Past: IV. The standard-cell comparator. A specialized potentiometer

Journal of Research of the National Institute of Standards and Technology (2000)

H. B. Brooks

The standard cell plays a very important role in the maintenance of the electrical units and in correlating the units of the various national laboratories. Modern standard cells have attained such a high degree of reproducibility and permanence as to warrant the use of apparatus of the utmost precision and reliability in their intercomparison. The paper describes a new potentiometer developed especially for this purpose. Although it actually measures the small difference between the known emf of a reference cell and that of the cell under test, it contains a simple mechanical computing feature which automatically adds this small difference algebraically to the emf of the reference cell and thereby indicates directly the value of the emf under measurement. The design of the instrument is such that no readjustment of its coils will be required when the impending changes in the ohm and the volt are accomplished. The new instrument has been given the distinctive name, "standard-cell comparator".

Potentiometer

10.6028/jres.105.059

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A method of exciting resonant vibrations in mechanical systems

Bureau of Standards Journal of Research (1933)

L. B. Tuckerman Hugh L. Dryden H. B. Brooks

This brief note describes the essential features of a method of exciting resonant vibrations in mechanical systems, developed for the study of the vibrations of aircraft propellers.

10.6028/jres.010.047

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Improved continuously variable self and mutual inductor

Journal of research of the National Bureau of Standards (1937)

H. B. Brooks Alexander Lewis

10.6028/jres.019.030

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Efficiency of complex projects

IEEE Transactions on Engineering Management (1966)

H. B. Brooks

In a complex process, the overall efficiency can be surprisingly low. Certain factors which control efficiency multiply against each other. If there are six of these “multifactors” and each has an efficiency of 70 percent, the overall efficiency is only 0.7 ⁶ , or 12 percent. Even worse overall degradation can be caused by “omnifactors,” which control the efficiency of many multifactors. Here, the efficiency drops exponentially with the number of multifactors affected. The remedy is to identify multifactors and omnifactors and to improve them or reduce their influence. Suggestions for doing this are discussed.

10.1109/tem.1966.6447097

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The accuracy of commercial electrical measurements

Journal of the American Institute of Electrical Engineers (1920)

H. B. Brooks

MEASUREMENT runs through the whole structure of engineering. A sufficient degree of maintained accuracy of measurement is essential. Uniform and logical guarantees or statements of accuracy should be used.

Degree (music)

Accuracy and precision

10.1109/joaiee.1920.6593632

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Dry casks for spent fuel storage transportation and disposal

Transactions of the American Nuclear Society (1983)

H. B. Brooks

waste disposal

Spent fuel pool

Source

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Timing Circuits

H. B. Brooks

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Testing potential transformers

Journal of the Franklin Institute (1913)

H. B. Brooks

10.1016/s0016-0032(13)91306-5

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An absolute electrometer for the measurement of high alternating voltages

Journal of research of the National Bureau of Standards (1938)

H. B. Brooks F. M. Defandorf F. B. Silsbee

An absolute electrometer of the attracted-disk type is described .It is suitable for the measurement of alternating voltages up to 275,000 volts effective value with an accuracy of a few hundredths of a percent.A set of equally spaced coaxial guard hoops, maintained at equally spaced potentials, serves to produce a uniform field at the disk in spite of the large separation (110 cm) required to avoid sparkover at the high operating voltage.Formulas are derived by which corrections can be applied for any deviation of the individually measured hoop potentials from the ideal equal spacing.The disk hangs from one arm of a delicate balance which serves to measure the force of attraction.Light reflected from a mirror carried by the balance beam serves to magnify its motion and to indicate to the operator at a safe distance when a condition of equilibrium is reached.It also serves to indicate the height of the disk relative to its surrounding guard ring.The scale reading corresponding to the ideal coplanar condition is obtained from auxiliary measurements made with a pair of special microscopes adapted for measuring distances in the line of sight by a calibrated focus adjustment.The change in the attractive force as the disk moves away from the coplanar position has been measured and compared with that calculated theoretically.The effects of this change on the sensitivity and on the stability of the balance are worked out in detail.Trials of this instrument under various conditions, both normal and with certain adverse influences exaggerated, over the range from 10,000 to 100,000 volts, indicate that the probable error of values obtained with it is about 0.01 percent, and that this error will not be greatly increased when the instrument is used at 275,000 volts.

Electrometer

Absolute (philosophy)

Alternating current

10.6028/jres.020.028

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The Standardization of Electrical Measuring Instruments

Transactions of the American Institute of Electrical Engineers (1923)

H. B. Brooks

This paper points out the advantages, both to the maker and the customer, of national standard specifications for manufactured articles. The history of standardization in England is outlined. British specifications for electrical instruments appeared first in 1909, and in improved and enlarged form in 1919. French specifications were adopted in 1921, German in 1922. The outstanding features of the three foreign specifications are compared. The British go into much detail concerning scale construction and marking, the French concerning definitions and temperature rises. The German specifications contain very good definitions of instruments and their parts, principles, etc. They prescribe severe tests for mechanical and thermal robustness, and have an elaborate scheme of symbols to indicate the grade, operating principle, kind of current, test voltage, etc. An account is then given of the consideration which the subject of instrument standardization has received in this country. The National Meter Committees have done a related piece of work by having the Meter Code prepared and revised, and have made recommendations to the makers from time to time concerning matters of instrument standardization. The Instruments and Measurements Committee of the Institute has considered the foreign specifications, and has determined by a personal canvass that a majority of American makers are in favor of standardization. However, this canvass also showed that most of them would have felt much freer to discuss proposed standard specifications rather than the abstract question as to whether specifications should be formulated.

Units of measurement

10.1109/t-aiee.1923.5060920

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