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16 vershocks = an arsheen.

An arsheen = 28 inches.

Three arsheens, or seven feet = a fathom[3], or sazshen.

500 sazshens = a verst.

A degree of longitude comprises 104–½ versts = 69–½ English miles. A mile is therefore 1,515 parts of a verst; two miles may then be estimated equal to three versts, omitting a small fraction.