224 Report on Trials of Plows. 



tion, having applied all the tests known to us, and having seen it 

 work in a variety of soils, and under very diversified circum- 

 stances, we are compelled to record our deliberate opinion that 

 this plow is one of the most valuable contributions that the 

 mechanic arts have ever made to agriculture, and that its wide 

 diffusion through the State of New York will add immensely to 

 the profits of agriculture by greatly increasing the fertility of 

 land at a very small cost. 



We subjoin a full and minute description of the plow and its 

 constituent parts. 



Description of F. F. Holbrook's Plow No. 69 — Class IV, 

 Entry No. 19. 



There is a point in every mould-board which coincides with the 

 edge of the slice at the instant that it assumes the perpendicular 

 position, and which is vertically above the sole of the plow, the 

 exact breadth of the furrow. This is called the zero iwint, and a 

 vertical line drawu through it and produced to the sole is the 

 zei^o line. In measuring this and all other plows described in this 

 report, we have dropped a plumb line to the plane of the sole 

 and measured in a straight line backward and forward to the point 

 from the zero line thus ascertained. 



Inches. 



From the zero point to the tip of the handle 41| 



From the zero point to the second cross-brace : 27| 



From the zero point to the first cross-brace IGj 



From the zero point to top of flanch where the handles are secured 11 2 



From the zero point to bottom of handles 7 



From the zero point to rear edge of mould-board 3| 



All the above measurements are rear; the rest are in front of 

 the zero point. 



Inches. 



From the zero point to heel of land side 1 



From the zero point to centre of standard IBs 



From the zero point to rear end of sole of share 15 



From the zero point to front of standard I64 



From the zero point to rear edge of coulter at top of beam 22^ 



From the zero point to angle of feather 21 



From the zero point to front edge of coulter at top of beam 251 



From the zero point to fore end of feather 311 



From the zero point to point of share 331 



From the zero point to point of coulter 35 



From the zero point to centre of wheel 43 4 



From the zero point to fore end of beam 51i 



From the zero point to centre of holes in bridle 525 



