They were commonly used between 1880 and 1900 to keep feet warm in unheated churches or carriages.
Antique Vintage Copper Foot Warmer Classic Car Footwell Heater Door Stop
Antique 1897 Victorian Diamond Jubilee Copper Drinks Tray Embossed Commemorative
Antique 1897 Victorian Diamond Jubilee Copper Tray Embossed Commemorative
Copper Foot Warmer Copper Hot Water Bottle Upholstered Box
Antique Large Copper Carriage Foot Bed Warmer 55cm! Beaumont & Saville Wakefield
Antique Victorian Copper Carriage Foot Warmer Made by Henry Loveridge, c. 1860