XXXVlll 



UNITS. 



Other measures are the — 



Surveyor's or Gunter's chain = 4 rods = 66 feet = 100 links of 7.92 inches 

 each. 



Fathom = 6 feet ; Cable length =120 fathoms. 



Hand = 4 inches ; Palm =: 3 inches ; Span = 9 inches. 



b. Surface or square measures. 



The unit of square measure is the square j^ard. Its relations to the principal 

 derived units in use are shown in the following table : — 



c. Measures of capacity. 



The unit of capacity for dry measure is the bushel (2150.4 cubic inches about). 

 The units of capacity for liquid measure are the British gallon (of 277.3 cubic 

 inches about) and the wine gallon (of 231 cubic inches, nominally). The latter 

 gallon is most commonly used in the United States. The following table shows 

 the relations of the sub-multiples and multiples of the bushel and gallon : — 



