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  Partner: UNT Libraries Government Documents Department
 Collection: Technical Report Archive and Image Library
Sound from dual-rotating and multiple single-rotating propellers

Sound from dual-rotating and multiple single-rotating propellers

Date: July 1, 1948
Creator: Hubbard, Harvey H
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Sound Insulation of Wall and Floor Constructions

Sound Insulation of Wall and Floor Constructions

Date: 1940
Creator: United States. National Bureau of Standards.
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Sound Insulation of Wall, Floor, and Door Constructions

Sound Insulation of Wall, Floor, and Door Constructions

Date: November 30, 1964
Creator: Berendt, Raymond D. & Winzer, George E.
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Sound-level measurements of a light airplane modified to reduce noise reaching the ground

Sound-level measurements of a light airplane modified to reduce noise reaching the ground

Date: January 1, 1949
Creator: Vogeley, A W
Description: An Army liaison-type airplane, representative of personal airplanes in the 150 to 200 horsepower class, has been modified to reduce propeller and engine noise according to known principles of airplane-noise reduction. Noise-level measurements demonstrate that, with reference to an observer on the ground, a noisy airplane of this class can be made quiet -- perhaps more quiet than necessary. In order to avoid extreme and unnecessary modifications, acceptable noise levels must be determined.
Contributing Partner: UNT Libraries Government Documents Department
Sound-level measurements of a light airplane modified to reduce noise reaching the ground

Sound-level measurements of a light airplane modified to reduce noise reaching the ground

Date: July 1, 1948
Creator: Vogeley, A W
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Sound measurements for five shrouded propellers at static conditions

Sound measurements for five shrouded propellers at static conditions

Date: April 1, 1950
Creator: Hubbard, Harvey H
Description: None
Contributing Partner: UNT Libraries Government Documents Department
A sound pressure-level meter without amplification

A sound pressure-level meter without amplification

Date: December 1, 1937
Creator: Stowell, E Z
Description: The N.A.C.A. has developed a simple pressure-level meter for the measurement of sound-pressure levels above 70 db. The instrument employs a carbon microphone but has no amplification. The source of power is five flashlight batteries. Measurements may be made up to the threshold of feeling with an accuracy of plus or minus 2 db; band analysis of complex spectra may be made if desired.
Contributing Partner: UNT Libraries Government Documents Department
Sound propagation into the shadow zone in a temperature-stratified atmosphere above a plane boundary

Sound propagation into the shadow zone in a temperature-stratified atmosphere above a plane boundary

Date: October 1, 1955
Creator: Pridmore-Brown, David C & Ingard, Uno
Description: None
Contributing Partner: UNT Libraries Government Documents Department
The source of propeller noise

The source of propeller noise

Date: May 1, 1937
Creator: Ernsthausen, W
Description: A two blade propeller of 40 cm diameter and zero pitch was explored for its noise development; it could be whirled up to 17,000 rpm - i.e., a tip speed of 355 meters/second. To obtain the power loss N(sub m) of the propeller for comparison with the produced acoustical power N(sub A) the engine performance characteristics were measured with and without propeller. The result is the sought-for relation c, that is, curve c' after correction with the engine efficiency.
Contributing Partner: UNT Libraries Government Documents Department
Source Strength Information for Shielding and Stack Effluent Calculations: a Standard Practices Guide

Source Strength Information for Shielding and Stack Effluent Calculations: a Standard Practices Guide

Date: October 3, 1958
Creator: Jones, L. H.
Description: Report presenting the curves and methods used "for determining gross fission product gamma energy in Mev/sec-watt, gross fission product beta decay in curies/sec-watt, delayed uranium fission neutrons in neutrons/sec-watt and N16 and N17 decay in photons/sec-cc of water" (p. 1).
Contributing Partner: UNT Libraries Government Documents Department