Rudiments of the art of building : represented in five sections [...] for the use of architects, builders, draghtsmen, machinists, engineers and mechanics (1853)
Bullock, John · New York : Stringer & Townsend · leaf 139
nail-hole. In preparing slates for use, the sides and bottom edgesare trimmed, and the nail-holes punched as near the head ascan be done, without risk of breaking the slate, and at auniform distance from the tail. The lap having been decided on, the guage will be equalto half the distance from the… … 1 . bo -4f-— The battens are of course nailed on the rafters at thegauge to which the slate will work. If the slates are ofdifferent lengths, they must be sorted into sizes, and gaugedaccordingly, the smallest sizes being placed nearest the ridge.The lap should not be less than 2, and need not…
Building
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