These depressions are called potholes, glacial potholes, kettles, or kettle lakes. It specialises in toasters, hair dryers, bread makers, kettles and sandwich toasters and other appliances. The nearby Ruxley factory manufactured kettles and coffee percolators. Membranophones are the drums, including kettles, clay pots, and barrels. Cooper's initial product offerings included plows, hog troughs, kettles and stoves. Abraham Darby I used it to cast pots, kettles and other goods. North of Mansion Beach are Clayhead and Pots & Kettles. There are many signs of glaciers including kames, eskers, kettles, and moraines. The simplest boil kettles are direct-fired, with a burner underneath. The design was inefficient even relative to the conventional stove-top kettles of the time. Traditionally, apple butter was prepared in large copper kettles outside. Outwash plains and valley trains are usually accompanied by basins known as "kettles". The use of electric kettles across Europe was sporadic. Southeast of Jackson Lake, glacial depressions known as kettles are numerous. The juice was skimmed and then channeled to successively smaller kettles.