London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 83
of eachplate, the ledge is only 2 in, instead of 3^ in. because it is over-lapped by the broader ledge of 3^ in. on the next plate. Theside i of Jg. 19. overlaps the side k of Jig. 20., as shown at e e,Jig. 18. The plates are secured together by small iron bolts,and are made perfectly air and water… … Fig. 21. is a vertical section of the plates, which shows the wall(«), the wall-plate (/-), the projecting piece that rests on the wall-plate (/), the joining of the ends of the plates (?«), and the tie-rod (n). Fig. 22. is an isometrical representation of part of the wall-plate,which is worked…
Architecture
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