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For the Purposes of this Act, Sixteen Cubic Feet of Stone, Ten Yards Square of Flag-stone (from One Inch and a Half to Three Inches Thick,) Ten Yards of Lineal Curb Stone (from Eleven to Thirteen Inches wide and from Five to Seven Inches Thick,) Fifty Cubic Feet of Round, or Forty Cubic Feet of Square Oak, Ash or Elm Timber, or Fifty Cubic Feet of Fir, or Deal, Balk, Poplar, or other Timber Wood, shall be deemed One Ton Weight.

Millers upon this Navigation are restrained from drawing their Mill Ponds more than Twenty-one Inches below the Height of a full Pond.

Vessels under Twenty Tons not to pass Locks without leave, or without paying for Tonnage to that Amount.

WHARFAGE RATES.
Goods or Merchandize remaining on the Quays or Wharfs, not more than Twenty-four Hours, are exempt.

Coal is likewise exempt from Wharfage Rates.

The chief object of this navigation is the supply of Chelmsford, and the interior of Essex, with coal, deals, timber, and groceries, and for the export of corn and other articles which this agricultural district produces.

CHESTER CANAL.
(SEE ELLESMERE AND CHESTER CANAL NAVIGATION.)

CHESTERFIELD CANAL.
11 George III. Cap. 7.5, Royal Assent 28th March, 1771.

THIS canal commences in the tideway of the Trent, at Stockwith, in Nottinghamshire, near to the place where the navigable River Idle falls into it, about four miles below Gainsborough. Its course is nearly west for six miles, passing round to the north of Gringley Beacon, whence it pursues a southerly course, to East Retford; thence, westward, by Worksop, to Shire Oaks, where it enters the county of York; when passing south of the village of Wales, and entering Derbyshire, it proceeds, in a southerly course, along the east bank of the River Rother, through a country abounding in coal, to Chesterfield, where it terminates. Its length is forty-six miles. From the Trent to Worksop it is twenty-four miles, with a rise of 250 feet; from thence, to the summit, at