210 Report on Trials of Plows. 



Class X. 



No. 21 F. F. Ilolbrook Boston. 



No. 27 L. D. Burch Sherburne, N. Y. 



Oil an examination of the preceding list of entries, it will be 

 observed that the plows entered by F. F, Holbrook are more 

 numerous than those of any other contributor, and that in ftict 

 the}^ are represented in nearly every class. These plows are all 

 constructed on a plan invented by Governor F. Holbrook, of Ver- 

 mont, and now a professor of Agriculture in Cornell University, 



We were instructed in the most minute details of this plow by 

 Gov. Holbrook, and the trials at Utica and subsequently at Brat- 

 tleboro showed very clearly the influence of the warped surface 

 which is generated by his method upon the texture of the soil. 



Governor Holbrook is as yet unprotected by a patent on his 

 method, and we are therefore most reluctantly compelled to 

 withhold a description of it, but we have no hesitation in saying 

 that it is the best system for generating the true curves of the 

 mould-board that has been brouoht to our knowledo-e. This 

 method is applicable to the most diversified forms of the plow, 

 to long or short, to broad or narrow, to high or low, no matter 

 what the form may be, this method will impress a family likeness 

 upon them all; there will be straight lines in each running from 

 the front to the rear, and from the sole to the upper parts of the 

 share and mould-board. None of these lines wnll be parallel to 

 each other, nor will either of them be radii from a common 

 centre. The angle formed by any two of them will be unlike 

 the angle formed by any other two; a change in the angle formed 

 by any of the transverse lines will produce a corresponding change 

 in the vertical lines, and there will always, in every form of the 

 plow, be a reciprocal relation between the transverse and vertical 

 lines. Plows made upon this plan may appear to the eye to be 

 as widely different as it is possible to make them, and yet, on the 

 application of the straight-edge and protractor it will ])e found 

 that they agree precisely in their fundamental character. The 

 surface of the mould-board is always such that the difterent parts 

 of the furrow slice will move over it with unequal velocities. 



Class I. — Sod Plows for Stiff Soils. 



The only entry in this class was by F. F. Holbrook of his Lap 

 Furrow Sod plow for stiff soils (No. 65). Weight, 130 pounds. 

 Price, $20. 



The soil was of a stiff, clayey consistency, and running at six 



