950 APPENDIX. 



1 7. Astronomical universal instrument, after G. Starke. A., page 1 33. 



18. Astronomical universal instrument, after G. Starke. E., page 39. 



19. Astronomical universal instrument, with telescope in the axis for 

 travelling purposes, after G. Starke. E., page 41. 



20. Transit instrument, after G. Starke. A., page 212. 



Illustrations of the Improvements in the Construction of the Hydrometrical 



Wing. 



21. Oldest construction, after Woltmann (1790). 



22. Improved construction, after Sadtler and Kraft. 



23. Improved construction, with differential wheels. 



24. Improved construction, after G. Starke. E., p. 73 (1870). 



25. Improved construction, after Amsler-Saffon (1870). 



26. Construction according to Amsler-Saffon with electro-magnetica 

 numbering apparatus (1873). E., p. 73. 



Illustrations of the Improvements in the Construction of Planimeter s. 



27. Polar planimeter, after Amsler (1856). 



28. Momentum planimeter (Integrator), after Amsler (1856). A., 4 part, 

 p. 36, E., page 81. 



29. Polar planimeter, after Miller and Starke (1856). A., 4 part, page 24. 



30. Polar planimeter, after Coradi and Ott (1874). 



31. Planimeter Wetli, Starke (1850, 1871). A., 4 part, page 8, E., 

 page 82. 



Illustrations of the Improvements in the Construction of Levelling Instruments. 



32. Vitruv's water-level (63 before Christ, 14 after Christ). 



33. Water-level, after Picard (1620-1682). 



34. Water-level, after Huyghens (1629-1695). 



35. Water-level, after de la Hire (1704). 



36. Water-level, after Eomer (1644-1710). 



37. Channel level (Picard). 



38. Mercury level, after Keith (1790). 



39. Vega's levelling diopter (1754-1802). 



40. Liesganig's water level (1719-1799). 



41. Sisson's water-level (18th century). 



42. Stampfer's levelling diopter (1839). F., page 24. 



43 1 . Hogrewe's levelling instrument (1800). 



43 2 . Pocket levelling instrument, after G. Starke. F., page 33. 



43 3 . English levelling instrument, by Cooke and Son. E., page 65. 



44. English universal levelling instrument, by Cooke & Son. 



44 2 . Levelling instrument, with Stampfer's levelling screw (1836) A., 

 page 197. 



45. Universal levelling instrument, with Stampfer's levelling screw, after 

 G. Starke (1867), F., page 146, and G. 



46. Universal levelling instrument with telescope, after G. Starke (1867). 

 F., page 174, and H. 



^ 7. Tachymeter, after G. Starke (1872). F., page 103, and I. 



48. Polymeter, after Jahns (1873). K. 



49. Tachygraphometer, after Wagner (1869-1871), constructed by Fennel. 

 It. 



50. Aneroid, after Naudet. F., 2nd part, page 35. 



51. Aneroid, after Goldschmidt. F., 2nd part, page 49. 



