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Just hearing a pin drop is easy… (Apr, 1954)

I think these guys should sue Sprint for stealing their catch-phrase.

Just hearing a pin drop is easy…

Bruel & Kjaer instruments analyze sound and put it in writing for you
Since Bruel & Kjaer instruments present essential data so easily, they greatly simplify the analysis and control of sound, vibration, and noise.

For example, the Spectrum Recorder automatically “scans” any sounds from 35 to 18,000 cycles per second in third-octave steps. Chart records, produced immediately, indicate both frequency spectrum and signal amplitude. The instrument saves hours of engineering time in analysis of sounds and vibrations, and in studies of strains, pressure variations, complex electrical voltages, and magnetic tape recordings.

Developed for laboratory use, the line of Bruel & Kjaer instruments is finding ever-broader use in industry. For information on acoustical and electro-acoustical measurements that can be made easily with these instruments, write Brush Electronics Company, Dept. B-4, 3405 Perkins Avenue, Cleveland 14, Ohio.
BRUSH ELECTRONICS COMPANY
formerly
The Brush Development Co.
Brush Electronics Company is an operating unit of Clevite Corporation
INDUSTRIAL AND RESEARCH INSTRUMENTS
PIEZOELECTRIC MATERIALS
ACOUSTIC DEVICES
MAGNETIC RECORDING EQUIPMENT
ULTRASONIC EQUIPMENT

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