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To turn a modern thermometer into a thermoscope we need only remove the figures from its scale. If we make the experiment with two such thermoscopes we at once become aware of something which usually escapes us, our attention being fixed on the figures recorded by the two instruments.
The writer of 'A Night with Edison' has described him as bending like a wizard over the smoky fumes of some lurid lamps arranged on a brick furnace, as if he were summoning the powers of darkness. 'It is much after midnight now, says this author. 'The machinery below has ceased to rumble, and the tired hands have gone to their homes. A hasty lunch has been sent up. We are at the thermoscope.
The 'micro-tasimeter, a delicate thermoscope, was constructed in 1878, and is the outcome of Edison's experiments with the carbon button.
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