A sound pressure-level meter without amplification / by E.Z. Stowell.

Format:

Book

Government document

Author/Creator:

Stowell, Elbridge Z., author.

Contributor:

United States. National Advisory Committee for Aeronautics, issuing body.

Series:

Technical note (United States. National Advisory Committee for Aeronautics) ; 629.

Technical note / National Advisory Committee for Aeronautics ; No. 629

Language:

English

Subjects (All):

Sound--Measurement.

Sound.

Measuring instruments.

Decibels.

Physical Description:

1 online resource (4 pages, 5 unnumbered pages) : illustrations.

Place of Publication:

Washington, [D.C.] : National Advisory Committee for Aeronautics, 1937.

Summary:

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.

Notes:

Description based on online resource, PDF version; title from title screen (viewed June 18, 2020).

"December 1937."

"Langley Memorial Aeronautical Laboratory."

No Federal Depository Library Program (FDLP) item number.

Electronic reproduction. Denton, Texas : University of North Texas, 2011. Electronic reproduction from print master produced by University of North Texas.

Other Format:

Print version: Stowell, E. Z. A Sound pressure-level meter without amplification

OCLC:

1159597640