1930s Griswold Cast Iron Stove Damper

1930s Griswold Cast Iron Stove Damper

I bought these and it took me a few minutes to realize what they were. They are a damper for a flue used in a stove chimney. Regulates the air flow of the chimney.

The largest patent date on these was filed in 1936 and granted on March 7, 1939. Patent No. 1,697,100 shows that Carl R. Anderson was the inventor while working for Griswold.

IT'S SO COLD IN HERE!
In 1742, Benjamin Franklin (perhaps fed up with the cold Pennsylvania winters) invented a better way to heat rooms. The "Franklin stove", as it came to be called, was a metal-lined fireplace designed to stand a few inches away from the chimney.