The VOLT, the unit of pressure, is the pressure which, when steadily applied to a conductor whose resistance is one ohm, will produce a current of one ampere.
The WATT, the unit of power, is 1/746 of one horse-power, the horse-power being 33,000 lb. raised one foot in one minute. The Board of Trade unit is 1000 Watt-hours.
In carbon lamps of 16-candle power (nominal) about four watts are required per candle power to give good economical results for domestic purposes. One Board of Trade unit will keep a 16-candle carbon lamp alight for about 16 hours; metallic filament lamps require considerably less. { 157}
Stock or kiln bricks 8 3/4 inches × 4 1/4 × 2 3/4 Welsh fire-bricks 9 inches × 4 1/2 × 2 3/4 Paving bricks 9 inches × 4 1/2 × 1 3/4 Square tiles 9 3/4 inches × 9 3/4 × 1 Square tiles 6 inches × 6 × 1 Dutch clinker bricks 9 1/4 inches × 3 × 1 1/2
A Rod of Brickwork 16 1/2 feet × 16 1/2 feet × 1 1/2 brick thick = 306 cubic feet, or 11 1/3 cubic yards, and contains about 4500 bricks with about 75 cubic feet of mortar.
Ordinary bricks weigh about 7 lb. each; a load of 500 weighs about 1 ton 11 cwt. 1 qr.
A Piece of Wall Paper is 12 yd. long × 21 in. wide (English), and 9 yd. × 18 in. (French).
40 cubic feet rough, 50 cubic feet squared = 1 load 50 cubic feet of planks = 1 load 100 superficial feet = 1 square of flooring 120 Deals = 100
Width of Battens, 7 inches; Deals, 9 inches; Planks are 2 to 4 inches thick, and 10 or 11 inches wide. A Cord of Wood is 2 1/2 tons, or 128 cubic feet.
Wheat and other cereals are commonly sold by weight, the bushel being thus reckoned:
Wheat, English, 60 lb. Foreign, 62 lb. Barley, English, 50 lb. French, 52 1/2 lb. Mediterranean, 50 lb. { 158} Oats, English, 39 lb. Foreign, 38 and 40 lb. Rye and Maize, 60 lb. Buckwheat, 52 lb.
Truss of Straw, 36 lb. Truss of Old Hay, 56 lb. Truss of New Hay (to September 1), 60 lb. Load, 36 Trusses — Straw, 11 cwt. 2 qr. 8 lb.; Old Hay, 18 cwt.; New Hay, 19 cwt. 1 qr. 4 lb.
_Cotton and Spun Silk Count._ — Thread = 1 1/2 yards; Lea, or Skein, _skn._ = 120 yards; Hank, _hk_ = 7 Skeins, or Leas = 840 yards; Spindle, _spdl._ = 18 Hanks; counts = the number of Hanks in 1 lb.; Bundle Hanks, either of 5 lb. or 10 lb.; Reels of Cotton vary from 30 to 1760 yards; they must be marked correctly. Bundles of Cotton are chiefly made up for export.