The Latrobe Stove, also known as a "Baltimore Heater", was a coal-fired parlor heater made of cast iron and fitted into fireplaces as an insert. They were patented in 1846 and were very popular by the 1870s. The squat device was invented by John Hazelhurst Boneval Latrobe (1803–1891). He was the son of noted engineer and architect Benjamin Henry Latrobe II. Latrobe became a patent lawyer and was shy about taking credit for his stoves which succeeded Benjamin Franklin's much larger Franklin stove.