A white cardboard box, printed with black and red lettering, contains a number of long glass ampules (smoke tubes). The tubes are held vertically within cardboard serrations and may be removed and replaced through the top portion of the box. The box contains four smoke tubes. The smoke tubes taper at both ends and contain a granular grey material.
Accession Number: 2016.phlt.1.113.1-5
Primary Materials: Cardboard, Glass
Box: Length = 16.5, Width = 9, Height = 3.5.
The box contains the following information:
“For estimating the velocity of slow-moving ventilating currents by timing the travel of smoke given off by the tube when air is aspirated through it. The smoke may also be used to indicate the direction of air currents.”
Good: The box is worn at its edges and is missing its lid. It does not contain a complete set of tubes.
Mine Safety Appliances (MSA). Pittsburgh, Pennsylvania.
Date of Manufacture:
Additional Information and References: