b'bO 



PREFACE 



Believing that the study of Agricultural Engineering 

 should fill an important place in the training of the young 

 man who would make farming the object of his life's work, 

 the author has attempted to furnish in this volume an aid in 

 supplying this part of his training. The application of 

 agricultural engineering methods to agriculture should not 

 only raise the efficiency of the farm worker but should also 

 provide for him a more comfortable and healthful home. 



This volume has been written primarily as a text for 

 secondary schools of agriculture, and for colleges where only 

 a general course can be offered. Claim is not made for 

 much new material concerning the subjects discussed; but 

 rather an attempt has been made to place under one cover 

 a general discussion of agricultural engineering subjects 

 which hitherto could not be secured except in several vol- 

 umes and hence impractical for text-book purposes. 



No attempt has been made to outline the exact method 

 for the teaching of the subjects, as this must vary with con- 

 ditions. It is desirable that classwork upon the text should 

 be supplemented by laboratory work. The nature of the 

 laboratory work will depend upon the equipment available. 

 It is suggested that the equipments on the nearby farms 

 may be used to good advantage. Sample machines to be 

 used for study may be secured by co-operation with dealers 

 in farm machinery. 



The author will be very glad to receive criticisms and 

 suggestions from those using this text, in regard to how it 

 may be improved and made more useful. The correction 

 of any errors will likewise be appreciated. 



