M.S.A. Methane Detector.
Made from a metal alloy, plastic, glass, steel and iron. Size 9 1/2″ x 4 1/2″ x 2 1/4″ inches.
This large M.S.A methane detector was designed to be powered by a cap lamp battery with a specially designed stainless steel top with two power cable attachments, one to power the methanometer and the other to power the cap lamp for the operator of the detector. The methanometer still has the power cable attached though battery top and power source is sadly missing from the unit.
It has harness hoops for a user to strap around his neck and lockable latches to secure the operating knobs and switches (as seen left) under the top cover.