Rare French Copper Plate for Reaumur Scale Thermometer dated 1830 - No glass For Sale

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

Rare French Copper Plate for Reaumur Scale Thermometer dated 1830 - No glass:
$39.00

1830 French copper plate that is the back/scale for a Reaumur thermometer. Basically, this temp scale is \"0\" for freezing and \"80\" for boiling. On the back appears the makers mark in ink, which appears to be \"C. Nullen Friebergen No. 4305\". I have made no attempt to clean this unusual item. I found a photo on line of a similar item that is a beautiful copper color. Thanks for looking!