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.
A barge to be weighed was brought into a supporting cradle connected by levers to a weighing mechanism. The water was then drained downstream 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 by measuring the displacement of water in the lock after the barge had entered. This method also requires that the unladen weight of the barge be known.
An example of a weigh lock (now dry), once part of the Erie Canal, may be found in downtown Syracuse, New York, along with a canal barge and interpretive displays at the Erie Canal Museum.
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Famous quotes containing the words weigh and/or lock:
“My sweetest Lesbia let us live and love,
And though the sager sort our deeds reprove,
Let us not weigh them: Heav’n’s great lamps do dive
Into their west, and straight again revive,
But soon as once set is our little light,
Then must we sleep one ever-during night.”
—Catullus [Gaius Valerius Catullus] (84–54 B.C.)
“As soon as you are in a social setting, you better take away the key to the lock of your heart and pocket it; those who leave the key in the lock are fools.”
—Johann Wolfgang Von Goethe (1749–1832)