. The Street railway journal . so, upon inclinedside bearings so that, as shown in Fig. 16, which isa cross section of a typical Porter-Allen steam cylinder,the cover plate may be lifted slightly by means of set- January, 1898.] STREET RAILWAY JOURNAL. 25 screws beneath the chest, thus permitting the valve tomove freely between the seat and plate and yet remainsteamtight. On the exhaust side the cover plate is screwedfast at the sides as shown, so that the valve will not belifted by the pressure in the steam cylinder, freedom ofthe valve being secured by scraping. Referring to Fig. 15,it will
. The Street railway journal . so, upon inclinedside bearings so that, as shown in Fig. 16, which isa cross section of a typical Porter-Allen steam cylinder,the cover plate may be lifted slightly by means of set- January, 1898.] STREET RAILWAY JOURNAL. 25 screws beneath the chest, thus permitting the valve tomove freely between the seat and plate and yet remainsteamtight. On the exhaust side the cover plate is screwedfast at the sides as shown, so that the valve will not belifted by the pressure in the steam cylinder, freedom ofthe valve being secured by scraping. Referring to Fig. 15,it will be seen that the ports at the valve seats are wide the block. In the stationary form, now rarely seen, thelink is suspended at the center, and thus is called station-ary, and the block is swung. This was the form of linkoriginally used by Mr. Allen. Mr. Porter afterwarddesigned the link, of which a side view is shown in and an edge view in Fig. 21. The link is broughtclose up to the shaft and forms part of the eccentric. FIG. 15
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
