PYREX Flameware Blue bubble 1-1/2qt Double Boiler with lid F*S import_2021_05_15_235529 we simply submitted the serial

we simply submitted the serial number and were paid by Paillard

The wire and clamps are for connecting for voltage tests

Patent dates are July 1

Conceived in the 1920s

PYREX Flameware Blue bubble 1-1/2qt Double Boiler with lid F*S import_2021_05_15_235529 we simply submitted the serial1940s vintage PYREX Flameware Blue bubble 1 1 2qt Double Boiler with lid. Here is one of a pair of my Mother's Pyrex flameware double boiler, with stainless steel bands holding the glass handles on 2 saucepans with one fitting inside the other to create the Double Boiler. My Mother always said that this is "absolutely necessary" if you want to make 7 minute frosting. The double boiler is 8" high with the lid on. 12" wide with the handle. 6" in