This section is from the book "The Tinman's Manual And Builder's And Mechanic's Handbook", by Isaac Ridler Butt. Also available from Amazon: The Tinman's Manual And Builder's And Mechanic's Handbook.
Glaziers' work is sometimes measured by the sq. ft., sometimes by the piece, oral so much per light; except where the glass is set in metallic frames, when the charge is by the foot In estimating by the sq. ft., it is customary to include the whole sash. Circular or oval windows are measured as if they were square.
 
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