NUMBER OF SLATES PER SQUARE
========+=========+=========+=========+=========+=========
Size |Number of| Size |Number of| Size |Number of
Inches | Pieces | Inches | Pieces | Inches | Pieces
--------+---------+---------+---------+---------+---------
6 × 12 | 533 | 9 × 16 | 246 | 14 × 20 | 121
7 × 12 | 457 | 10 × 16 | 221 | 11 × 22 | 138
8 × 12 | 400 | 9 × 18 | 213 | 12 × 22 | 126
9 × 12 | 355 | 10 × 18 | 192 | 13 × 22 | 116
7 × 14 | 374 | 11 × 18 | 174 | 14 × 22 | 108
8 × 14 | 327 | 12 × 18 | 160 | 12 × 24 | 114
9 × 14 | 291 | 10 × 20 | 169 | 13 × 24 | 105
10 × 14 | 261 | 11 × 20 | 154 | 14 × 24 | 98
8 × 16 | 277 | 12 × 20 | 141 | 16 × 24 | 86
========+=========+=========+=========+=========+=========
In Table XII is given a list of the different colors of slate used
in the Eastern and Middle States, the quarries from which they are
obtained, and the cost of slate, labor, etc. per square, pertaining to
each variety. The prices in the table are based on the 8 in. × 12 in.
or 9 in. × 18 in. sizes, thickness five to 1 inch, and for quantities
of not less than 50 squares. The cost of labor, etc. being based on
current prices in the aforementioned territory.
Slate ¼ inch thick cost about 20 per cent. more than the five to 1 inch
for the material, and about 5 per cent. more for laying and freight.
Slate ⅜ inch thick cost about 45 per cent. more than the five to 1 inch
for the material, and about 15 per cent. more for laying and freight.
When copper nails are specified obtain current prices.