This section is from the book "Cassell's Cyclopaedia Of Mechanics", by Paul N. Hasluck. Also available from Amazon: Cassell's Cyclopaedia Of Mechanics.
Fig. 1 is an end elevation, and Fig. 2 a little more than one-fourth of the side elevation, of a Dutch barn that is 40 ft. long, 18ft. wide, and 16 ft. to eaves. Fig. 3 shows the form and construction of the trusses. It will be noticed that purlins, not rafters, are used, so that the boarding can be fixed running down, as shown. The wet can be better kept out by weathering the boards, as shown at Fig. 4. Oak will be best for the posts, which should go into the ground about 4ft. or 5 ft., and be well rammed in. Deal will probably be good enough for all the other parts. The boarding (l in. thick) to the ends and sides may be grooved and tongued, or lapped similar to the roof. To keep the structure rigid, it must be braced with 4-in. by 3-in. braces, as indicated by the dotted lines on the boarding at Figs. 1 and 2.
Design for a Dutch Barn.
 
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