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| Index No. A7064 | Silver Pocket Thermometer |
| A late 18th Century Austrian explorers pocket thermometer in a silver open face case. Plain brass plate with a large bimetallic circular strip at its edge acting on a brass rack. This acts on a central brass pinion held in tension by a blue steel spiral hairspring. Signed white enamel dial marked from minus 30 degrees to 130 degrees, the scale indicated as "Eispunct - Reaumur - Siedpunct". Slender blue steel hand. Slim plain silver open face case. | ||
| Signed | Johann Holzmann in Wien | |
| Circa | 1790 | |
| Diameter | 55 mm | ||
| An early example of bimetallic pocket thermometer used by explorers. Johann Holtzmann - Vienna, master 1789. |
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