Index. 



287 



PAGE. 



Supplementary trials 2()3 



points of . 263 



draught experiments to de- 

 termine increase of power 

 for each inch of depth. 265-271 



remarks on same 272-276 



trials to determine increase 

 of power for each inch of 



width 277 



to determine increase of power 



for increase of velocity. 278, 279 

 to determine the proportion of 

 power absorbed by differ- 

 ent parts of the plow. 279, 280 

 to determine the influence 

 of the coulter upon the 



draught 280-282 



to determine relative draughts 



of Skim plow and coulter. 282 

 to determine the elasticity of 

 different soils 283 



PAGE. 



Swan, John, patent 72 



Swing plow, advantages of 175 



Tousley, Robert, patent 72 



Tull, Jethro. experiment on range of 



roots of plants 145 



Vcelcker's experiments 139 



Way's deductions as to separating 



power of soils 141 



"Webster, Daniel, his plow 103 



Weeds and stubble, to bury 198 



Wheatley, R. J., subsoil attachment. 241 

 Wheel of the plow 173 



mode of attaching 179 



Whiflfle-trees, observations on 194 



for three horses 195 



Wiley, James 101 



Wilkie's plow 50 



Witherow & Pierce, patent 1839 114 



Wood, Jethro, patent 72 



improved plow, 1819 84 



LIST OF FIGURES. 



Fig. p^'^e- 



1. Plow of Asia Minor 8 



2. Ancient Egyptian plow 8 



3. Roman plow 9 



4. 5. Form of plow as used by 



Cincinnatus and Cato 9 



6. Caschrom (British plow) 10 



7. East Indian plow 11 



8. Egyptian plow now in use .... 12 



9. Mexican plow 13 



10. Chinese plow 13 



11. English plow, A. D. 1470 14 



12. Saxon plow of eleventh century 14 



13. French (Canadian) plow 15 



14. Land side of Rotherham plow. 17 



15. Furrow side same 16 



16. Bridle, &c., same 17 



17. Brand's (Suflblk) plow 22 



18 to 27. Diagrams illustrating Mr. 



Jefferson's formation of mould- 

 board 24 to 31 



28. East Lothian plow 35 



29. Body frame of the same 39 



30. Sole bar of the same inverted. 39 



31. Vertical section same 40 



32 to 37. Share of the same 41 



38. Form of sock plate same 42 



39, 40, 41. Sole shoe same 43 



42. Edge view of the coulter, same 43 



43. Side view of the coulter, same 43 



44. Plan of bridle of same 44 



45. Side view same 44 



46. Elevation of the body in work- 

 ing position, same 45 



47. Horizontal sole shoe, same. ... 45 



48. Diagram of the formation of the 

 mould-board 46 



49. Diagram do do do 49 



50. Plow staff 51 



51. Hammer nut key 51 



Fig. pa°e. 



52. Diagram illustrating formation 



block for mould-board 57 



53 a. Shares, showing chilled parts 61 

 53 b. do do 61 



54. Mortised shoe 61 



55. Cast plow frames 61 



56. Mould-board and share show- 

 ing attachment to the frame . . 82 



57 to 60. Diagram showing Rham's 



formation of mould-board. . 63, 64 



61. Newbold's plow 67 



62. Chenoweth's plow 71 



63. Harris' plow, 1819 82 



64. Wood's plow 85 



65. Burden's plow 90 



66. Nourse's Eagle No. 2 94 



A. B. Dutchers' diagrams of forma- 

 tion of mould-board 98 



Daniel Webster's plow, land side. . . 104 

 Daniel Webster's plow, furrow side. 104 

 Daniel Webster's plow, dimensions . 105 



67. Jacobs' plow 108 



68. Diagram of Smith's Michigan 

 plow Ill 



69. Diagram of the right hand or 

 face view of Smith's mould- 

 board 112 



69 a to 69/. Parts of the same ... 113 

 [Figs. 9, 12, 14, 15, 16, 17, referred 

 to on page 114, are not reproduced 

 in this report, but all that is neces- 

 sary for the description is con- 

 tained in figs. 69 a to 69 b, p. 113.] 



70. Diagram of Witherow & Pierce's 



mould-board 115 



71 . Diagram of generating curve. . 115 



72. Elevation of Gibbs' plow 126 



73. Mead's share and mould-board 128 

 — fig. 1. lona turning jilow 129 



