Traegerwellblech and Asphalt. 77 



The curvilinear Traegerwellblech plates are more advan- 

 tageous than the straight ones in this respect, that they are 

 capable of withstanding eight times the load of the latter. 



The curved Traegerwellblech plate rests on the lower 

 flange of the girder, the supported ends are walled up, the 

 whole is then filled with ashes, sand, or clay, and levelled 

 over, and the floor laid down, which may be composed 

 of cement, asphalt, brick, or wood. 



A ceiling of Traegerwellblech, straight or arched, is not 

 only in conformity with all the exigencies demanded for this 

 part of an architectural structure, but it leads to the con- 

 struction itself of ceilings to the highest degree of perfection. 

 It is light ; it is a bearing and space-covering construction 

 at the same time ; it requires very little height, by which 

 the walls can be lower and therefore cheaper; it is fire- 

 proof, and can be used to ventilate ceiling and rooms. 

 Compared with wooden ceilings, it is cheaper by its 

 durability; it is absolutely cheaper than brick arched 

 ceilings, for which it is the most reasonable substitute in all 

 buildings where the by-laws require a fireproof covering of 

 rooms. 



These four drawings (Figs. 2 — 5) will explain the different 

 kinds of Traegerwellblech ceilings which have been carried 

 out in factories and private buildings. 



A further adaptation of Traegerwellblech is to be 

 found in fireproof staircases. The plates are laid in inclined 

 planes from one landing to another, the risers are formed 

 up with brick, and the treads are finished off with wood. 

 For wood may be substituted marble slabs, as, in certain 

 instances, has been the case. This drawing (Fig. 6) will give 

 a good idea of such a Traegerwellblech staircase. 



For fireproof curtains in theatres the Traegerwellblech is 

 the only material which satisfies all the conditions requisite 

 to establish it as a truly reliable safeguard against fire, 

 by which Traegerwellblech curtains, moved by hydraulic 

 pressure, are now applied to all the important theatres in 

 Germany. Mr. Seipp, of Berlin, who has devoted much 

 time and study to this matter, constructs these curtains as 

 shown by Fig. 7. 



The stronger Traegerwellblech plates, that is to say, those 

 of 11, 10, 9 B.W.G., have been most profitably employed as 

 bridge plates. 



Figs. 8, 9, and 10 show the construction of Traegerwell- 

 blech roofs. The remarkable feature of these roofs and domes 



