292 ARITHMETIC 



Wing Fronts. The fronts of the wings, properly called 

 shoulders; improperly called wing butts. 



Wing Points. The extreme outer ends of the flight 

 feathers. 



Work, Full of Work. A term used in England to de- 

 scribe a well-finished rose comb, the points of which are 

 perfect or nearly perfect. 



Wry Tail. A tail carried to one side. Fig. 33. 



ARITHMETIC 





MEASURES OF EXTENSION 



Measures of extension are used in measuring lengths (dis- 

 tances), surfaces (areas), and solids (volumes), and are 

 divided, accordingly, into linear measure, square measure, and 

 cubic measure. 



Linear measure has one dimension (length), square measure 

 has two dimensions (length and breadth), and cubic measure 

 has three dimensions (length, breadth, and thickness). 



LINEAR MEASURE 



12 inches (in.) '. . . = 1 foot ft. 



3 feet =1 yard yd. 



5$ yards =1 rod rd. 



320 rods =1 mile ml. 



in. ft. yd. rd. mi. 



12= 1 

 36= 3 = 1 

 198= 16*= 5= 1 

 63,360 = 5,280 =1,760 =320=1 

 SQUARE MEASURE 



144 square inches (sq. in.) =1 square foot sq. ft. 



9 square feet = 1 scuare yard sq. yd. 



30J square yards =1 square rod sq. rd. 



160 square rods =1 acre A. 



640 acres : =1 square mile sq. mi. 



