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Show la France Mona. Dufour has sue-if sue-if Weded In making thermometer tubiM ' pure quartz. Not only are these tnbea exceedingly transparent, but i lllelr realstance to heat and other ad- Hntagea make them suporlor to glass J 'or thermometers Intended to measure . 'Uh temperatures, In such thor-j thor-j ooinefcra melted tin takes tho place t mercury, and tho scale rends from ' bout 4C3 degrees Fahrenheit up to ' Wer 1,000 degrees. It could bo run i P to 1S0O degree, for quartz does aot soften below that temperature. |