History of the Plow. lb 



chiini the exclusive privilege of making, using and vending the 

 same. 



" Second — Shape of the throat and hind part of the mould- 

 board: The shape of the throat is exhibited in the accompanying 

 drawing, fig. 4, fig. 5, Plate VI. I construct this part of my 

 plow with a gentle curve from the top of the share entirely up 

 to the beam, which, at a suitable height for a plow designed to 

 turn a furrow slice of about twelve inches in width, say about 

 sixteen inches, will incline forward as it comes up to the beam to 

 form a birth for it to rest on in an easy circular form. I dress it 

 ofl' also round as it ascends from the share, making it broader 

 and broader as it approaches the beam. The object of this 

 peculiar shape is to prevent brambles, long grass, &c., from lap- 

 ping so short as they would do if the front of the throat were 

 sharp, and the inclination forward at the upper part of the throat 

 forms a curve with the under side of the beam, so as to prevent 

 anything in plowing to be jammed under the beam — the pres- 

 sure below naturally forces the incumbrance up and forward, 

 when it faces over and the plow cleans itself. This I consider 

 an improvement of great value in plowing in clover, long manure 

 and the like. The head part of the mould-board. Figs. 3 and 4, 

 y*, I dress off in a gentle curve from the end or wing of the sliare 

 up to the hind corner of the mould-board. This shape I have 

 ascertained to answer every purpose in turning over the furrow 

 slice, and as it does not come down to the bottom of the farrow 

 the plow works with much less friction, is lighter, cheaper and 

 handsomer. 



" Believing these shapes for the throat or breast, and the hind 

 part of the mould-board not to have been known or practiced 

 before my application of it, and that they constitute valuable 

 improvements in the construction of the plow, I claim the exclu- 

 sive right to use and dispose of them. 



" Third — The structure of the land side with the mould-board 

 and standard, or the fore and top part of the mould-board: 

 Charles Newbold made his mould-board, land side and stand- 

 ard of one piece, and of cast iron. In connecting his land side 

 to the mould-board, he made it nearly square and stout to give it 

 strength, I make my land side thin and broad, g, Fig. 5, which 

 gives more strength vertically, without so much weight. This 

 form also makes it a guard, which prevents sods, dirt, &c., from 

 working in and clogging tluit part of the plow. In order then 



