Later in the eighteenth century, another form of heating came into vogue. This was the fire frame, which appeared about thirty years after the invention of the Franklin stove, and in type was something of a compromise between the open fireplace and the stove, possessing certain characteristics of each. It was so arranged that it could be used in a fireplace that had either been filled in with brick, or finished with a fireboard, and in appearance was very similar to the upper part of a Franklin stove. Unlike the stove, however, it rested directly upon the fireplace hearth, instead of being raised from the floor.

When coal first came into use, a Salem man saw it burn, and so impressed was he with its worth that he told Dr. George Perkins of Lynde Street about it. The doctor immediately ordered a barrel of the fuel to be brought down in a baggage wagon from Boston, and he also ordered a new-fangled stove of the hob grate order. The trial took place in the living-room of his home, and the neighbors gathered to watch it burn. So great was the success of the venture that a load of coal was ordered, and it landed at the North River wharf, where the water was then so deep that vessels could easily come to pier there. The cargo consisted of from one hundred and sixty to one hundred and seventy tons, considered an enormous load at the time.

The first coal burned in a stove was in Wilkes-barre, Pennsylvania, where Judge Jesse Fell, in the main room of the old tavern, in February, 1808, started the first coal fire. Previous to that time coal had been burned in open forges, under a heavy draught, by a few blacksmiths, but it had never been adapted for household purposes, and the discovery that it could be used changed it from a useless thing to something of great value.

In 1812 Colonel George Shoemaker discovered coal in the Susquehanna Valley, and he took twelve tons of it to Philadelphia to sell. He disposed of two tons, but was compelled to give the rest away, as people considered him a fraud, proving that the use of coal was not general at this period.

The hob grate came into use in 1750, a few years after the advent of the Franklin stove, and it proved especially valuable for the burning of coal, when that product became popular. At first it was known as "Cat Stone," but later was called hob grate, by which name it is known at the present time.

Fenders of brass or iron were generally used with these grates, a small one placed close to the fire to prevent the ashes from falling over the hearth, and a larger one arranged around the entire fireplace. Although hob grates were popular in Northern houses, they were much more frequently used in the South.

Tiles were little used in America until the hob grate era, when they seem to have come into vogue. They were used to surround both hob grates and Franklin stoves. Some of them showed decorations of religious subjects, while others, like a set in a Salem house, told in pictures the story of Æsop's Fables. There is a tiled fireplace still in existence in the Saltonstall-Howe house at Haverhill, Massachusetts, a dwelling originally owned by Dr. Saltonstall, the first medical practitioner in the city. This fireplace, in the dining-room, shows a double row of tiles, depicting a series of Scriptural events, and it is equipped with a fender of ancient hammered brass, a family heirloom. The date of the fireplace can be definitely determined without knowledge of the time of the erection of the house from the fact of the absence of a mantel above. Another similar fireplace adorned with quaint Dutch tiles is shown in the Pickering house living-room. Like the Saltonstall one, this fireplace has a beautiful, ancient fender of brass and a pair of bellows that were made by Rev. Theophilus Pickering, a preacher in Essex, Massachusetts, who succeeded the Rev. John Wise.

The first hob grate ever placed in a Salem home is to be seen in the Waters house on Washington Square. It is topped with one of McIntyre's famous mantels, showing that the original fireplace was brought down to be used with the grate.

Elias Hasket Derby, one of Salem's most famous merchants, had a beautiful estate where Market Square now stands. The house, which was a marvel of elegance, stood in the center of the square, surrounded with terraced gardens that swept to the water's edge. After his death the house was too large and elegant to be kept up, and it was torn down and the land sold. The timbers of the house, the wood carving, and mantels were purchased by Salem house owners, one hob grate finding its way to the old Henry K. Oliver house on Federal Street. This dwelling, which was built in 1802 by Captain Samuel Cook for his daughter, who married Mr. Oliver, shows old-time fireplaces in many rooms, one of brass being found in the parlor. This was the first of its kind ever placed in a Salem home, and it has a grate, on either side of which are brass pillars about three feet in height, with brass balls on top. A brass band extends from pillar to pillar below the grate, and the fender is also of brass. The mantel above is elegantly carved, and came from the Elias Hasket Derby mansion.

A soapstone fireplace with grate is shown in the General Stephen Abbot house on Federal Street, where General Abbot, who served under Washington, entertained the latter during his visit to Salem. Behind this fireplace is a secret closet, large enough to conceal three men, where, during troublous times, slaves were hidden.