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  ABDNP201880a03.JPG - Thomas Jones: Portable Dial Thermometer Dial thermometers of the first half of the 19th century are uncommon, although a dial is easier to read than the standard liquid in glass column.  A few metallic thermometers were described in the late 18th century but this production of Thomas Jones in the second quarter of the 19th century is exceptional.  The sensitive element is likely to be a bimetallic strip, possible of steel and brass.  A miniature glass thermometer up the side provides confirmation (hopefully) of the reading for anyone nervous of the new technology.  The instrument is likely aimed at the gentleman traveller market rather than the meteorological observer. ABDNP:201880a  
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13 | Thomas Jones: Portable Dial Thermometer

Dial thermometers of the first half of the 19th century are uncommon, although a dial is easier to read than the standard liquid in glass column. A few metallic thermometers were described in the late 18th century but this production of Thomas Jones in the second quarter of the 19th century is exceptional. The sensitive element is likely to be a bimetallic strip, possible of steel and brass. A miniature glass thermometer up the side provides confirmation (hopefully) of the reading for anyone nervous of the new technology. The instrument is likely aimed at the gentleman traveller market rather than the meteorological observer.

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