IMPROVED GRATE BARS AND BEARER. Our engravings illustrate a new form of grate which it is claimed is not only of unusual durability but it also offers the advantage of a considerable saving in the cost of fuel. Fig. 1 shows a perspective view of the bars of which a suitable number are joined together to form convenient sized sections. A is a longitudinal brace to which are attached the trans verse bridges B B o r one of which an end view is shown in Fig. 2. The same illustration represents an end section of the bars and the manner in which the latter are connected by the transverse blocks C. It also will be noticed that the interstices or slots between the bars are widest at the bottom. The upper surface of the grate is corrugated the object be ing to give an equal amount of metal at every point and thus obviate the warping due to unequal contraction and expansion. There is also an other and important advantage gained by this mode of construction. On the perfectly flat surface which would be afforded were the bars even on top a thick layer of coal would easi ly pack and forming clinker would make an air-tight covering and thus effectually hinder the draft. This difficulty it is claimed is entirely avoided by the corrugations which admit of a free circulation of air un der the fuel from the fact that there will always be portions of the bars generally the lowest points of the curves—on which the coal will not directly rest so that open spaces will be formed through which air can pass. Moreover the irregular sur face serves as a guide to the fireman to inform him in cleaning the fire when his slice bar has reached the grate. The shape of the interstices between the bars to which attention was directed above is favorable to the ready passage of the ashes while it aids in preventing clogging by clinker or otherwise. The ends of the bars are open and beveled as shown the points of the extremities of two contiguous sections meeting on the upper surface of the bearer. T
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