206 Proceedings of Royal Society of Edinburgh. [sess. 
MEASUREMENTS OF THE RECORDING APPARATUS. 
First Lever. 
1. Length of upright, shod with sapphire, 35 mm. 
2. Distance of power from fulcrum, 5 mm. 
3. Length of lever from power, 205 mm. (Aluminium.) 
Second Lever. 
4. Length of short arm, 25 mm. 
5. Length of long arm, 110 mm. 
Third Lever. 
6. Length of short arm, 6 mm. 
7. Length of long arm, 95 mm. 
8. Length of upright carrying syphon, 75 mm. 
9. Length of weight, 25 mm. 
10. Diameter of weight, 10 mm. 
11. Length of screw, 130 mm. 
12. Diameter of drum with roughened sides on head of screw, 80 mm. 
13. Distance of wire from point of aluminium lever, 35 mm. 
14. Length of fine wire dipping into mercury trough, 16 mm. 
15. Length of support of Hg trough, 130 mm. 
16. Diameter of Hg trough, 15 mm. 
17. Length of electro-magnet of paper apparatus, 85 mm.; also of adjuster, 
85 mm. 
18. Distance of adjuster pulley to two pulleys, 250 mm. 
19. Distance from centre of band of recording paper to adjuster, 208 mm. 
20. Distance from centre of pulley driving phono-cylinder or mandrill to 
centre of nearest pulley, 130 mm. 
21. Distance of electro-motor to nearest pulley, 720 mm. 
22. Height of electro-motor, 170 mm. 
23. Diameter of electro-motor, 110 mm. 
24. Diameter of pulley on electro-motor, 40 mm. 
25. Diameter of pulley on syphon, 55 mm. 
26. Height of rod, 400 mm. 
27. Length of short arm of syphon, 40 mm. 
28. Length of long arm, 80 mm. 
29. Length of transverse wire of second lever, 80 mm. 
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