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Fires improv'd: being a new method of building chimneys, so as to prevent their smoaking: in which a small fire, shall warm a room better than a much larger made the common way. With the manner of altering such chimneys as are already built, so that they shall perform the same effects... / Written in French, by Monsieur Gauger: Made English and improved by J.T. Desaguliers... By whom is added, the manner of making coal-fires... The whole being suited to the capacity of the meanest workman.

Gauger, Nicolas, approximately 1680-1730

Date:: 1715

Credit: Fires improv'd: being a new method of building chimneys, so as to prevent their smoaking: in which a small fire, shall warm a room better than a much larger made the common way. With the manner of altering such chimneys as are already built, so that they shall perform the same effects... / Written in French, by Monsieur Gauger: Made English and improved by J.T. Desaguliers... By whom is added, the manner of making coal-fires... The whole being suited to the capacity of the meanest workman. Source: Wellcome Collection.

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The common way of Building Chimneys with the Jams parallel, and the Breaft inclin’d, ts not pro= per for refletting Heat into a Room. [ Fig. 3.) Sars the Fire Ff in a com-: ù > mon Chimney ABb4,whofeSides. or Jams AB, ab, are parallelto each other, the: Rayof Heat fG, willbe reflected to M; the: Ray fH upon it felf into f, the Ray f/ into: N; and the RayfLinto P; and as the Ray fL going fromfto L, conftantly rifes, as it: does alfo when after Reflection it goes from, -L to P, [ Fig.3] it muft get within the Flue: before it reaches P, and then wherever it ftrikes agaïnft oR,the fore part of the Funnel} which isinclin’d to the Horizon, it will be: reflected upwards into the Chimney, always: fippofing the Angle of Incidence equal to that: of Reflection, and therefore it cannot go in-- to the Room. | + (Fig. 1.] Thus if we examin all the Rays: ~ that fall between H and a, we fhall find that: none can be reflected into the Room except: thofe that fall uponthe extremity of the Jam: towards 2;. but as. they have loft aes of! | their:

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