. Les Bairds de Gartsherrie. Quelques avis de leur origine et de leur histoire . an et Calder Ironworks, ont mis en place un appareil à peu près à la même époque, qui est quelque peu semblable à la mine dans sa construction, mais il n'a pas réussi à élever la chaleur à une température si élevée, de la demande des arrêts sur le tuyau principal, par lequel, dans mon invention, l'air a été fait pour traverser le four tant de fois, et ce qui rend mon appareil pratique et économique par rapport à tout appareil utilisé précédemment. Ces appareils de chauffage étaient toutefois coûteux, en raison des ruptures fréquentes de tuyaux, et après le hav

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. The Bairds of Gartsherrie. Some notices of their origin and history . an and Calder Ironworks, brought out an apparatus about the same time, which is somewhat similar to mine in its construction, but it failed to raise the heat to so high a temperature, from the want of the stops on the main pipe, by which, in my invention, the air was made to traverse the furnace so many times, and which is that which renders my apparatus practical and economical in comparison with any apparatus used previously. These heaters were, however, expensive, on account of frequent breakages of pipes, and after having con- tinued to use them for some years, a pipe of an entirely THE BAIRDS OF GARTSHERRIE. G3 different character was invented at Gartsherrie. A plan of a heater with these new pipes was completed towards the end of 1846, and the first heater on this principle was put in usein connection with No. 9 furnace, in the summer of 1847.The following section shows the lying-pipe on each side of the fire, and the upright pipes fitted into it. A, Fire Grate.B B, Lying Pipes.. C C, Upright pipes, with direction of air current. D D, Brickwork ofStove. This was found to work so satisfactorily, that as rapidlyas heaters on the same construction could be prepared andfitted up, they were applied to all the other furnaces be-longing to the company at Gartsherrie and elsewhere—super-seding those previously in use. Similar pipes have beenadopted at most of the Scottish ironworks, and at someworks in England. In the year 1849 a patent wastaken for using the waste heat at the top of the furnaces, for the purpose of heating the air, in an apparatus con-; structed with these pipes, and placed at the top of the furnace. It worked very well, but was afterwards abandoned. 64 THE BAIRDS OF GARTSHERRIE. 1 Having got the heaters into something like working order, we continued making iron with the two furnaces till 1833, when we erected the furnace No. 3. It was put in blast onthe 3rd of April, 1834. It

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