248 



Report on Trials of Plows. 



for an actual trial of this plow in the kind of land for which it 

 was specially intended; but from the trials which we made in 

 adhesive soils, from a study of its shape and a test of the material 

 of which it was composed, we had not the shadow of a doubt of 

 its admirable adaptation to work in this kind of soil with entire 

 success, and therefore awarded to it a gold medal. 



Class X — A Swing or Sideiiill Plow. 



Two entries were made in this class, viz.: F. F, Holbrook, No. 

 6, Sivivel Plow; weight, 136 pounds; price, $20. Lyman D. 

 Burch, Sherburne; weight, 110 pounds; price, $15. 



The plow made by Mr. Holbrook is laid out by an exceedingly 

 ingenious process, with which we were made fully acquainted, but 

 which we cannot make public, as it is not patented. We exceed- 

 ingly regret the necessity for this enforced reticence, as the dia- 

 grams given in full would elucidate very clearly some important 

 points in the general theory of the plow, and in the special theory 

 of swivel plows, which we think are at present very ill under- 

 stood by the users of plows. A very good idea of Mr. Holbrook'y 

 plow will be obtained by an examination of the annexed Fig. 122. 



It, like all other swivel plows, consists of a half of two mould- 

 boards combined in one; but, unlike others, it is so combined as 

 that the one-half shall help the other all the way from the zero 

 line forwards, so that a full sized furrow slice may be properly 

 turned. It worked well in all respects, was very strong, and was 

 thoroughly well made in all its parts. It pulverized the ground 

 very thoroughly, and l)nned the weeds very well. Its chief 



