SPROCKET In a roof, a short timber placed on the back and at the foot of a rafter to form projecting eaves; hence a SPROCKETED roof.
STACK A flue or chimney, or group of chimnies.
In a roof, a short timber placed on the back and at the foot of a rafter to form projecting eaves; hence a sprocketed roof.SpurDiagonal projection at the base of a moulding, column, or buttress (called a spur buttress).
Bell Cast
- a levelling out of a roof pitch over a wall head which achieves a bell like shape. Usually achieved by fixing short timbers called sprockets or cocking pieces to the feet of the rafters. Can be very graceful.
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 See also: Timber, Rafter, Eaves, Tower, Pitch
  
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