Fourthly, In Common Stoves and Chimnies, the upright Heat (which has been computed to be Three Fourths of the whole) is intirely lost, as to the Purpose of warming the Room, or those that are in it. On the contrary, in this Stove-Grate, a very inconsiderable part of the Heat ascends with the Smoke, and all the rest is diffused gradually, and equally, over the whole Room.
Fifthly, This Fire-Place, thus prepared, prevents Smoke so effectually, and so certainly, in all Degrees and Variations of Wind and Weather, that the Inventor is willing to give his Machine, Gratis, if ever the least Smoke is perceived in any Room where it is erected; unless it may happen at the first lighting of the Fire, before the Air in the Funnel is put in Motion; but I have never yet seen that happen.
There is no Occasion for Chimney-Boards in Summer, for by turning the Register, the Air is shut out; so that both in Summer and Winter, the Furniture and Gilding, is preserved from Smoke and damp Air; which are the chief Causes of the one and the other’s being spoiled.
Sixthly, It will be obvious to every Person, who examines the Construction of this Machine, that the Chimney will not require sweeping in less than two or three Years; and that it is morally impossible the Chimney can ever take Fire.
Seventhly, It has been already observed, that no part of the current of Air, that passes continually through the Fire, is supplied from the Doors, Windows, or Crevices of the Room: For the same Reason, the Candles, in all sorts of Weather, will burn clear; the Light will be pleasant, equal, and steady; and there will be a considerable Saving in that Article.
Eighthly, When the Room is thoroughly warmed in the Day-time, it will cool but a few Degrees during the Night; and by shutting up the Fire-Place over Night, and excluding the external Air, the Fire will be found in the Morning without any sensible Diminution, ready to blaze out, by the Addition of a Stick of Wood, or a few Coals; which every body knows is an Advantage, that never could be obtained in common Chimnies, with a Coal Fire, without a great Expence, and much Danger.
These, and many other Advantages, that would be tedious to enumerate at present, will be found to result from this useful Invention. Several of the Stove-Grates are already set up; and Orders given for the erecting others in many Houses in London and the Country.
Some are of Cast Iron, in its plain, natural Colour; and others have a Case, richly ornamented, that is put on, and taken off, at Pleasure. The Inventor hopes he shall be permitted to publish the Names and Places of Abode, of those Noblemen and Gentlemen, who have encouraged this undertaking.
By this Method it will be in the Power of those who incline to become Purchasers, to inform themselves of the Truth of every Particular, by Persons of undoubted Credit and Veracity; and to know, with Certainty, what they are to expect, without laying out their Money, upon what they might suppose, an unexperimented Project; the Success whereof might otherwise be uncertain.
There are Three Sizes of these Stove-Grates, adapted to the Dimensions of the Rooms where they are set up. They are all made of Cast Iron, which will endure longer, and come much cheaper, than if they were made of wrought Iron.