Mechanics' magazine and register of inventions and improvements . need oidy state that chairsmay be made of wrought iron, on the sameprinciple which I am now describing, to suitany of the ordinary forms of rail now in use;but for the purposes of this specification Ishall confine my descrij)tion to the form ofchair required for the form of rail shown insection at fig. 3. Having, in manner hereinbefore described,cut the rolled bar into proper lengths forchairs, they will assume the form shown atfig. 4, which is a transverse section, aabeing the holes for the spikes or fasteningswhich hold it to
Mechanics' magazine and register of inventions and improvements . need oidy state that chairsmay be made of wrought iron, on the sameprinciple which I am now describing, to suitany of the ordinary forms of rail now in use;but for the purposes of this specification Ishall confine my descrij)tion to the form ofchair required for the form of rail shown insection at fig. 3. Having, in manner hereinbefore described,cut the rolled bar into proper lengths forchairs, they will assume the form shown atfig. 4, which is a transverse section, aabeing the holes for the spikes or fasteningswhich hold it to the block or support; and Inext proceed to shape tiie cheeks OP, moreaccurately to fit the under side of the rails,which if placed in the chair in its presentstate would have tlie appearance sliown at , and would be too unsteady for their pur-pose. In order to effecJ this, and to form atthe same time a proper recess in the cheekO, for the wedge or key, which is used towedge or, key up the ends of the rails tightin the chair, I make use cf a cold wrought or. cast iron mandrel, as shown at figs. G and 7,in the following manner : Having heated thechair again in the furnace, I place the man-drel between the cheeks, OP, of the chair,and present it with the mandrel in ii: to passthrough another pair of rollers, as shown atfig. 8, which rollers press the cheeks OPclose upon the mandrel, I; and when thechair leaves these rollers it is complete ; andif the mandrel be withdrawn, and the railnow inserted in it, will have the appearanceshov/n at fig. 9, being the recess or apertureinto which the wedge or key is to be drivento fix the rails finnly and steadily in theirplaces. The dotted lines in this figure showthe alteration in form which the chair hasexperienced by passing through (he rollersshown at fig. 8. Fig. 10 represents a wrought iron chair,made of more than one piece, and in thischair the cheeks of the chair are made to fitthe rail by rivetting pieces of iion rolled tothe pro
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Keywords: ., bookcentury1800, booksubjectindustrialart, booksubjecttechnology
