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TM 5-6640-214-14
2-12. MUFFLE FURNACE AND PENETROMETER CABINET.
a. Component Parts. A muffle furnace and penetrometer are permanently mounted on the elevating platform of the
cabinet (fig. 2-15). The muffle furnace consists of muffle chamber with door and steel tray, and a base housing a
temperature gage (pyrometer) with both Celsius and Fahrenheit scales, percentage timer, pilot light, ON-OFF toggle
switch, and electric cord. The penetrometer consists of base, support rod, dial, indicator, plunger, penetration plunger,
and weights.
Penetration cone and needle for use with penetrometer, along with other miscellaneous equipment, are stored in a
drawer at the bottom of the cabinet.
Figure 2-15. Muffle Furnace and Penetrometer Cabinet (Unit No. 5).
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