20 



ENGINEERING ON THE FARM 



The square and cubic units are the squares and cubes of 



the linear units. 



Metric Conversion Table 



X .03937= inches 

 X .3937= inches 

 X 3281 =feet 

 X . 62 1 = miles 



Millimeters 

 Centimeters 

 Meters 

 Kilometers 



Square centimeters X .155= square inches 



Square meters 



Hektare 



Cubic centimeter 



Cubic meters 



Liters 



Liters 



Liters 



Kilograms 



Kilowatts 



X 10 . 764 = square feet 



X 2 . 47 1 = acres 



4-16. 383 = cubic inches 



X35- 3I5 = cubic feet 



X61 .022 = cubic inches (Act of Congress) 



X .2642 =gallons (231 cu. in.) 



-r- 28. 316 = cubic feet 



X 2 . 2046 = pounds 



X 1 . 34 = horse-power 



■B-45* 



MISCELLANEOUS MEASURES 



Circular measure. Circular measure gives the position 

 of an object on the circumference of a circle. The unit of 

 measurement is the degree, equivalent to -g^ of the circum- 

 ference. Each degree is divided into 

 60 minutes, and each minute into 60 

 seconds. Circular measure, when 

 expressed in degrees, indicates the 

 amount of change in position of an 

 object with reference to some fixed 

 point on the circumference, but it does 



Fig. 4. The location not S ive the distance actually traveled 

 of an object on a circle can by the object in making the change 



be described without ref- . 1 . 



erence to distance. if unless other definite distances relating 

 7Js ie % 'TV >,i to the circle are expressed. For ex- 

 changed its position 45°. amp l e , from a given point an object 



If it moves around to C, ^ ° * 



it has changed 150 , and has moved 90°, or a quarter of the way, 



if it moves to D, 225°. * ,1 • c u ^.t, 



around the circumference, but the 

 actual distance traveled by the object cannot be deter- 

 mined unless the radius or other distances are known (Fig. 4). 



C - /50 



