File:1911 Britannica - Annealing - Automatic Oil Muffle Furnace.png
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1911_Britannica_-_Annealing_-_Automatic_Oil_Muffle_Furnace.png (521 × 257 pixels, file size: 84 KB, MIME type: image/png)
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| Description |
English: A muffle furnace, employed for annealing, hardening and tempering. The heat being obtained by means of petroleum, which is contained in the tank A, and is kept under pressure by pumping at intervals with the wooden handle, so that when the valve B is opened the oil is vaporized by passing through a heating coil at the furnace entrance, and when ignited burns fiercely as a gas flame. This passes into the furnace through the two holes, C, C, and plays under and up around the muffle D, standing on a fireclay slab. The doorway is closed by two fireclay blocks at E. Illustration from 1911 Encyclopædia Britannica, article Annealing. |
| Date | |
| Source |
Encyclopædia Britannica Eleventh Edition, Vol. 2, Page 72  |
| Author | Encyclopædia Britannica, 1911 |
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This image comes from the 13th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States. |  |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 13:19, 26 July 2012 | | 521 × 257 (84 KB) | Clarice Reis (talk | contribs) |
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