Weigh lock

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A weigh lock on the Lehigh Canal around 1873 Weighing the Cargoes in the Weigh Lock on the Lehigh Canal.jpg
A weigh lock on the Lehigh Canal around 1873

A weigh lock is a specialized canal lock designed to determine the weight of barges in order to assess toll payments based upon the weight and value of the cargo carried. This requires that the unladen weight of the barge be known.

Canal Man-made channel for water

Canals, or navigations, are human-made channels, or artificial waterways, for water conveyance, or to service water transport vehicles.

Barge flat-bottomed boat, built mainly for river, canal transport of heavy goods, usually pushed by tugboats

A barge is a flat-bottomed ship, built mainly for river and canal transport of heavy goods. Some barges are not self-propelled and must be towed or pushed by towboats, canal barges or towed by draft animals on an adjacent towpath. Barges contended with the railway in the early Industrial Revolution, but were outcompeted in the carriage of high-value items due to the higher speed, falling costs and route flexibility of railways.

Contents

A barge to be weighed was brought into a supporting cradle connected by levers to a weighing mechanism. The water was then drained and the scale balance adjusted to determine the barge gross weight. Subtracting the tare weight (the weight of the barge when empty) would give the cargo weight. Originally weighlocks measured the weight of the barge, initially by measuring the displacement of water from the lock by collecting the liquid in a separate measuring chamber after the barge had entered. [1] This method also requires that the unladen weight of the barge be known.

Tare weight, sometimes called unladen weight, is the weight of an empty vehicle or container. By subtracting it from the gross weight, the weight of the goods carried may be determined. This can be useful in computing the cost of the goods carried for purposes of taxation or for tolls related to barge, rail, road, or other traffic, especially where the toll will vary with the value of the goods carried. Tare weight is often published upon the sides of railway cars and transport vehicles to facilitate the computation of the load carried. Tare weight is also used in body composition assessment when doing underwater weighing.

Weigh lock on the Erie Canal in Syracuse, New York, in 1903. Today this building is the Erie Canal Museum. The current canal now passes well behind this location. The old route through the central city has long been filled in and is now a paved boulevard. Weigh Lock on Erie Canal in Syracuse from HABS.tif
Weigh lock on the Erie Canal in Syracuse, New York, in 1903. Today this building is the Erie Canal Museum. The current canal now passes well behind this location. The old route through the central city has long been filled in and is now a paved boulevard.

See also

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Erie Canal Museum

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Toll point

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<i>Elmer S. Dailey</i>

Elmer S. Dailey, originally known as the Claire B. Follette, is a wooden barge built by William H. Follette in 1915 at Tonawanda, New York, and rebuilt and renamed in 1928 by Brown Drydock on Staten Island, New York. It was used to transport materials from New York, New Jersey and Connecticut. It is the only known surviving Erie Canal boat and is one of a few remaining wooden-hulled canal boats. It sank in 1974 along with the Priscilla Dailey and the Berkshire No. 7 in the harbor of Bridgeport, Connecticut on the west side of the Pequonnock River. It has deteriorated to the point that a salvage operation could result in it breaking apart. It was added to the National Register of Historic Places on December 21, 1978.

To weigh something is to measure its weight.

References

  1. Laws of the State of New York, in Relation to the Erie and Champlain Canals. II. State of New York. 8 February 1825. pp. 254–6.