scalage

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. An assessed percentage of the total price or measured amount of goods being shipped or stored, used to figure a deduction from the price or amount to reflect normal shrinkage or depletion of the goods.
2. n. The estimated amount of lumber in logs being scaled.

Century Dictionary and Cyclopedia

1. n. In leather manufacturing, an allowance in weight of hides, usually about 15 per cent., made for scalings that may drop off.

WordNet 3.0

1. n. estimation of the amount of lumber in a log
2. n. the act of scaling in weight or quantity or dimension