copper, Weight of..

238

gauges, Sizes of B. & S. and Birmingham..

249

rope, Steel.

212

rope, Strands in.

212

tables..

.247-251

Underwriters' line.

247

Wires, Equivalent areas of, B. & S. gauge.

248.

Wiring, Bell..

241

Interior.

235

16 square rods

SURVEYOR'S SQUARE MEASURE.

625 square links (sq. li.)

1 square rod

1 square chain

sq. rd.

10 square chains.

sq. ch.

1 sq. mi. = 640 A. = 6,400 sq. ch. = 102,400 sq. rd.

The acre contains 4,840 sq. yd., or 43,560 sq. ft., and is equal to the area of a square measuring 208.71 ft. on a side.