42 Report on Trials of Plows. 



plate forged for the express purpose at the iron mills, and known 

 in the trade by the term sock plate. Fig. 38 represents the form 



in which those plates are 

 0^^ — V-Jl7~~~~'"~^>-^ manufoctured, the thick- 



\ \ej '^^^^^^^^ ness beino- from one-half 



d. 



& 



IvP^ -X^— - ^li to three-quarters of an 



^^ -_,^ . , -^ ^^ inch; they are afterwards 



'^K^^^^-^^"""^ cut in two through the 



" ine a b, each half being 



capable oi lorming a 

 share. To do this, an incision, c o, is made on the short side to a 

 depth of two inches; the part a. c d e\^ afterward folded down 

 to form the sole flange, and the part h f g is in like manner folded 

 dowai to form the land side flange. The point h is strengthened, 

 when requisite, to receive the proper form of the shield and 

 point, the latter being tipped with steel. The edge, li c, is 

 extended to the requisite breadth to form the feather. In order 

 to cut a sock plate at the proper angle, so as to secure a minimum 

 expenditure of lal)or and material, let a central line, h h, be drawn 

 upon the plate, and lu'sect this line in the point A-, the line upon 

 which the plate should be cut will form angles of 70 deg. and 110 

 deg. nearly with the line Ji If, or mechanically draw k I equal to 

 five and one-half inches, at right angles to hh, and draw h' 

 parallel to h h, mark off two inches from I to i, and through the 

 point a i k draw the line a h, which is the i:)roper direction in 

 which the plate should be cut. 



The Sole Shoe. — The figures 39 to 41 are illustrative of ihc 

 sole shoe. Fig. 39 is a plan of the shoe, a a being the sole flange, 

 and b b the land side flange; Fig. 40 is an elevation of the same, 

 and Fig. 41 a cross section, showins: the fillinsr up of the inteiiia! 

 angle, opposed to w^here the greatest wear takes place. 



The thickness of the sole flange at the heel a is seven-cighdis 

 of an inch, diminishing forward to three-eighths of an inch at 

 three inches from the point, and thence it is thinned oft' to pi-c- 

 vent obstruction in its progress through the soil. The breadlli cf 

 the sole is two and one-quarter inches, and its extreme leiiglh 

 twenty and one-half inches. The side flange is one-half of an inch 

 thick along the edge, by which it is attached to the sole, diminish- 

 ing upward to one-quarter of an inch at the top edge, the height 

 being four and three-quarter inches at the heel, and six inches at 

 llio fore did ; \ho Avoiglit is altouf fourlcon pounds. The upjxT 



