DESCRIPTION or THE DIVIDING ENGINES 697 



30. Hardened steel centres for corrector frame. 



31. Eocking shaft, rotated by means of lever 28. 



32. Bearing for wrist-pin of lower corrector frame. 



33. Crank for rocking corrector; a slight rotation of the shaft 3?, thus 



giving a slight sidewise motion to the frame 39. 



34. Hocking stem, which moves the lifting-lever 56, of ruling head. 



35. Eod to communicate reciprocating motion to 34. 



36. Base-frame of engine. 



37. Casings of ruling carriage, holding the adjustable box-wood slides, 7. 



38. Adjustable weight for corrector lever. 



39. Lower corrector frame, moved by the crank 33. 



39 A. Corrector guide-plate, along which the wings of the nut move. 



40. Lever for engaging and disengaging pawl, by means of bell-crank 42. 



41. Pawl, driving ratchet wheel. 



42. Bell-crank which is pivoted on 26; to one end the pawl is attached, 



and the other is raised by the lever 40 and lowered by the 

 weight 45. 



43 and 44. Adjusting screws attached to 42, for regulating the pawl 

 engagement. The stops are attached to 26 and 40. 



45. Weight hanging from bell-crank. 



46. Cam operating lever, 40; attached to main shaft. 



47. Cam operating pawl-lever, 26; attached to main shaft. 



(These two cams regulate the number of teeth of ratchet wheel 

 which the pawl clears each revolution of the main-shaft.) 



48. Driving pulley, attached to main shaft. 

 48 A. Main shaft. 



49. Connecting rod to give reciprocating motion to diamond-holder by 



means of 52 and 37. 



50. Crank arm, designed to vary the length of stroke of the diamond. 



51. Bar connecting cross-head 52, and ruling frame 37. 



52. Cross-head, driven by connecting rod 49. 



53. Oscillating rod, connecting 35 and 54. 



54. Lever operating stop mechanism for lifting diamond, resting on 55. 



55. Cam attached to main shaft and operating the lever 54. 



56. Lever for lifting rod 57; it is operated by the rocking-stem 34. 

 56 A. Stop-plate regulating drop of rod 57. 



57. Rod for lifting diamond. 



58. Dash-pot attached to the lever which carries the diamond-holder 2, 



and which is pivoted at 3. 



59. Adjustments for holding and regulating the dashers. 



