696 HENRY A. EOWLAND 



Explanation of Numbers in the Cuts 

 (Similar numerals refer to like parts throughout the different views.) 



1. Euling diamond. 



2. Adjustable diamond holder. 



3. Adjustable support for the axis of the diamond-frame. 



4. Euling-head, carrying ruling mechanism. 



5. Bods of the ruling carriage. 



6. Plate to be ruled. 



7. Adjustable box-wood slides of ruling carriage. (N. B. There are 



box-wood slides pressed against the sides as well as the top of 

 the ways of the frame.) 



8. Plate-holder. 



9. Clamps for plate-holder. 



10. Bed-plate. 



11. Plate-carriage, which is moved by the nut and which rests on ways. 



(N. B. The plate-carriage has a cross-beam below the feed- 

 screw. See Fig. 5.) 



12. Feed-screw. 



13. Hardened steel step in end of feed-screw. 



14. Hardened steel thrust-screw. 



15. Casing of the split nut, holding the plugs 16. 



16. Lignum vitas plugs, tapped for engaging feed-screw. 



17. Adjusting rings for nut, with their adjusting screws. 



18 and 19. Wings of the nut, controlled by the corrector, 39 A. 



20. Thrust collar, loosely attached to plate-carriage, 11. 



21. Abutting lugs, rigidly attached to nut-casing 15, and in contact 



with collar 20. 



22. Abutting lugs of plate-carriage, in contact with screw-heads in 



collar 20. 



23. Graduated ratchet-head attached to the feed-screw. 



24. Disc for phase-adjustment of corrector, being movable around the 



axis of the screw in the plane of the ratchet wheel. 



25. Eccentric for adjusting amplitude of corrector, being movable 



around an axis near one end so as to vary the eccentricity. 



26. Pawl-lever, which raises or lowers the pawl, when it is disengaged 



or engaged, respectively, in the ratchet wheel by means of lever 

 40. 



27. Hollow arbor, serving as pivot for pawl-lever. 



28. Corrector lever, resting on 25, and pivoted at 31. 



29. Corrector frame. 



