Thermochrom Crayons (Pencils),. 1950-53
- maker:
- A W Faber-Castell
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Set of 12 thermochrom pencils in a box, by A.W. Faber-Castell, Stein, Nuremburg, Germany, 1950-53. Used for checking surface temperature by colour change on contact with surface, 65-600°C.
Details
- Category:
- Heat
- Object Number:
- 1953-344
- Materials:
- paper (fibre product), cardboard and fire clay
- Measurements:
-
overall (box closed): 16 mm x 121 mm x 125 mm, , .275kg
- credit:
- Allied Colloids (Bradford) Ltd.
