1Abigail Adams to Elizabeth Smith Shaw, 19 July 1787 (Adams Papers)
...Sent you a Tea urn, it is packd in a Box with one for Sister Cranch. you will find an Iron calld a heater. This when the water is boild, you heat red hot & put in the tin middle peice which keeps the water hot during the whole process of tea making. I have also sent you a little contrivence for lighting a candle when your fire is out, the directions for useing are round the case...