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Brüel and Kjær Pistonphone Calibration Instrument

DLSPH Occupational Health

A rectangular wooden case, lined in black fabric, contains a number of objects:
– A circular barometer used to calibrate the instrument.
– A Type 4220 Pistonphone instrument resembling a silver tube.
– Several smaller pieces including a screwdriver with a red handle.

Accession Number: 2016.phlt.1.100.1-9

Alternative Name:

Primary Materials: Glass, Steel, Rubber, Plastic, Wood


On the pistonphone is a sticker that reads:
“Occupational Medicine & Hygiene
University of Toronto
(416) 978-2745″

The instrument’s serial number is embossed on its surface: “365260”

Dimensions (cm):

Box: Length = 4.8, Width = 27.5, Height = 21.2


This instrument is used to calibrate sound measuring equipment.

Condition: Excellent

Associated Instruments:

Manufacturer: Brüel & Kjær. Nærum, Denmark

Date of Manufacture:


Additional Information and References:

Historical Notes: