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
Primary Materials: Glass, Steel, Rubber, Plastic, Wood
On the pistonphone is a sticker that reads:
“Occupational Medicine & Hygiene
University of Toronto
The instrument’s serial number is embossed on its surface: “365260”
Box: Length = 4.8, Width = 27.5, Height = 21.2
This instrument is used to calibrate sound measuring equipment.
Manufacturer: Brüel & Kjær. Nærum, Denmark
Date of Manufacture:
Additional Information and References: