In Fig. 241 is shown a Fink truss, which is a very popular form, especially for trusses built of steel. It has neither king-post nor queen-posts, and the tie-beam A is of iron or steel instead of timber. This is a simple and cheap form of truss for any situation where there is no floor or ceiling to be carried by the lower chord. The struts B may be of wood or of cast iron. It will be seen that the truss consists essentially of two trussed rafters set up against each other, with a tie-rod A to take up the horizontal thrust.

Fig. 241. Section Showing Design of a Fink Truss

Fig. 241. Section Showing Design of a Fink Truss.

Open Timber Trusses

Besides the forms of trusses described above, there are other forms which are used in churches and chapels, as well as in halls where open timber work is required, and where the trusses will not be concealed by other finish, but will be made ornamental in themselves. Among these the most common forms are the so-called scissors truss and the hammer beam truss.