ery limited small plate girders are sometimes usedfor bracing the portal. The use of latticed portals is very common.A well designed portal of this type which is used by the NorthernPacific Railroad,is shown in Fig.39. Small Knee-braces are used Inthis case, 1 1 — 25. PEDESTALS. The pedestals… … Fig.ifO. Fig. M. Fig.i«) shows a pedestal used extensively for short spans.It consists of bolster-plates riveted by means of angles to a shoe-plate. The total thicKness of the bolster-plates is governed bythe required amount of bearing area on the pin. The tv/o inside an-gles are often omitted,but…
