APPENDIX. 



SYNOPTIC CONVERSION OF ENGLISH AND METRIC UNITS. 



Metric to English. 



Units of length. 

 I metre (lo*' microns). 



I kilometre. 



Units of area. 



I square centimetre. 



1 square metre. 

 It i( 



I hectare. 



I square kilometre. 



Units of volume. 



I cubic centimetre. 



I cubic metre or stdre. 

 ti (( (( 



Units of capacity. 

 I litre (61.023 cubic inches). 



I hectolitre. 



a 



Units of mass. 

 I gramme. 

 I kilogramme. 



« 



I tonne. 

 (( 



Units of velocity. 

 I metre per second. 



39-3700 

 3.2S083 

 1. 0936 1 

 0.62137 



0.15500 

 10.7639 



I- 19599 

 2.47104 

 0.38610 



English equivalents. 



inches, 

 feet, 

 yards, 

 miles. 



square inches, 

 square feet, 

 square yards, 

 acres, 

 square miles. 



0.0610234 cubic inches. 



35-3M5 cubic feet. 



^•30794 cubic yards. 



0.26417 gallons (U. S.). 



1.0566S quarts (U. S.). 



0.21993 I™P- gallons (British). 



2.83774 bushels (U. S.). 



2.75121 bushels (British). 



154324 grains. 



2.20462 pounds avoirdupois. 



35--739 ounces avoirdupois. 



32.1507 ounces troy. 



0.98421 tons (2240 lbs.). 



1. 1 023 1 tons (2000 lbs.). 



3.2808 feet per second. 



2.2369 miles per hour. 



0.62137 miles per hour. 



Logarithms. 



1.595165 

 0.515984 

 0.038 863 

 9-793 350 — 10 



9-190 331 — JO 



1 .03 1 968 

 0.077 726 

 0.392 880 

 9.586701 — 10 



8.785496 — 10 



1-547 953 

 0.116589 



9.421884 — 10 

 0.023 944 

 9.342291 — 10 



0-452973 

 0-439 523 



1.188433 



0-343 334 

 1-547454 

 1.507 190 

 9.993086 — 10 

 0.042 304 



0.515984 



0-349653 

 9-793350—10 



981 cm.) = 7.2330 X 10-* poundals. 



{See def. p. 172.) 



I km. per hr. (0.2778 m. per sec.) 



Units of force. 

 I dyne (weight of (981)"^ grammes, for^ 



Units of stress — in gravitation measure. 

 1 gramme per square centimetre. o 014223 pounds per sq. inch. 



I kilogramme per square metre. 0.204817 pounds per sq. foot. 



I standard atmosphere. 14.7 pounds per sq. inch. 



Units of work — In absolute measure. 

 I erg. 2.3730 X 10-* foot poundals. 



I megalerg = 10^ ergs ; i joule = 10^ ergs. 



— in gravitation measure. 

 I kilogramme-metre {ior ^s^ = 9S1 cm.) = 9S1 X 10'' ergs = 7.2330 foot-pounds. 



Units of activity (rate of doing work). 

 I watt = I joule per sec. (= 44.2385 foot-pounds per minute, for^= 981 cm.) = 0.10194 



kilogramme-metre per sec, for^= 981 cm. 

 I force de cheval = 75 kilogramme-metres per sec. = 735I watts = 0.98632 horse-power. 



Units of heat. 

 I calorie or kilogramme-degree = 3.968 pound-degrees, F. = 2.2046 pound-degrees, C. 

 I small calorie or therm, or gramme-degree = o.ooi calorie or kilogramme-degree. 



Smithsonian Tablcs. 



174 



