Table 1 



FOR CONVERTING U. S. WEIGHTS AND MEASURES.* 



CUSTOMARY TO METRIC. 



The only authorized material standard of customary length is the Troughton scale belonging to this office, whose 

 length at icf.bz Fahr. conforms to the British standard. The yard in use in the United States is therefore equal to 

 the British yard. 



The only authorized material standard of customary weight is the Troy pound of the Mint. It is of brass of 

 unknown density, and therefore not suitable for a standard of mass. It was derived from the British standard Troy 

 pound of 1 75S by direct comparison. The British Avoirdupois pound was also derived from the latter, and contains 

 7,000 grains Troy. 



■|'he grain Troy is therefore the same as the grain Avoirdupois, and the pound Avoirdupois in use in the United 

 States is i-qual to the British pound Avoirdupois. 



The British gallon = 4.54:546 litres. The British bushel := 36.3477 litres. 



The length of the nautical mile given above and adopted by the U. S. Coast and Geodetic Survey many years 

 ago is defined as that of a minute of arc of a great circle of a sphere whose surface equals that of the earth (Clarke's 

 Spheroid of 1866). 



* Issued by U. S. Office of Standard Weights and Measures, and republished here by permission of Superintendent 

 of Coast and Geodetic Survey. 



Smithsonian Tables. 2 



