The Incandescent Lamp And Its Manufacture
The Incandescent Lamp And Its Manufacture
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If, however, the mercury in the pump is at TOdeg. , and the lamps be heated to near the softening point of the glass, and are sealed off while at that temperature, they will still be full of mercury vapour and air at the same pressure as before only, though at the very much higher temperature. When the lamps have cooled, the tension of the mercury vapour in them will be very much less than 50 millionths of an atmosphere. It is, therefore, prob- able that lamps sealed off while hot will have bet...ter vacuums* than if sealed off cold. * In the factory the plural " vacua " is seldom used. 172 THE INCANDESCENT LAMP AND ITS MANUFACTURE. For a similar reason, it would appear wrong to heat the mercury in the pumps. If the mercury and pumps are heated, the vapour will have a still greater tension than 50 millionths of an atmosphere, and the vacuum will be correspondingly poorer, both as regards the mercury vapour and air. If the lamps are sealed off at a lower temperature than that of the mercury, mercury vapour may even be condensed in the lamps.
What to read after The Incandescent Lamp And Its Manufacture?
You can find similar books in the "Read Also" column, or choose other free books by Gilbert Scott Ram to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
If, however, the mercury in the pump is at TOdeg. , and the lamps be heated to near the softening point of the glass, and are sealed off while at that temperature, they will still be full of mercury vapour and air at the same pressure as before only, though at the very much higher temperature. When the lamps have cooled, the tension of the mercury vapour in them will be very much less than 50 millionths of an atmosphere. It is, therefore, prob- able that lamps sealed off while hot will have bet...ter vacuums* than if sealed off cold. * In the factory the plural " vacua " is seldom used. 172 THE INCANDESCENT LAMP AND ITS MANUFACTURE. For a similar reason, it would appear wrong to heat the mercury in the pumps. If the mercury and pumps are heated, the vapour will have a still greater tension than 50 millionths of an atmosphere, and the vacuum will be correspondingly poorer, both as regards the mercury vapour and air. If the lamps are sealed off at a lower temperature than that of the mercury, mercury vapour may even be condensed in the lamps.
What to read after The Incandescent Lamp And Its Manufacture?
You can find similar books in the "Read Also" column, or choose other free books by Gilbert Scott Ram to read onlineMoreLess
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