| 摘要 |
The device for sighting inside of the furnace consists of caps (8,11) in front and rear surface (e) rotary plate (20) having the colored glass to see the inside, and main body (2). The main body (2) includes the compartments (4,5) for inserting the electric bulb (27) and electric cell (26), the sighting hole (3) at the middle part for receiving the lens (7). The front cap (8) is inserted in the lens (9) and packing (10), and the rear cap (11) is mounted at a spring (14) and terminal plate (15).
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