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Walker, Ezckirl. On the Plumb-line and Spirit- 

 level. Nicholson, Journ. L, 1802, pp. 309-312. 



2. On URADLEY'S method of observing 

 Transits, and another method by which the 

 thickness of the wire is rendered of no import- 

 ance. Nicholson, Journ. II., 1802, pp. 22-23. 



3. Method:; of diminishing the irregularities 



of time-pieces, arising from differences in the 

 arc of vibration of the pendulum. Nicholson, 

 Journ. II., 1802, pp. 76-78. 



4. On the vibration of rate in a time-piece, 



as indicated by the changes in the arc of vibra- 

 tion. Nicholson, Journ., II, 1802, pp. 273-276. 



5. Experimental proof that corrections 



deduced from the arcs of vibration of a pendulum 

 in vacua are practically useful. Nicholson, 

 Journ. III., 1802 : pp. 35-36. 



6. A method of increasing the light att'orded 



by candles and to obviate the necessity of snuffing 

 them. Nicholson, Journ. III., 1802, pp. 272- 

 275 ; Gilbert, Annal. XIII., 1803, pp. 240-243. 



7. On the quantities of light afforded by 

 candles in proportion to the consumption of 

 material and other objects respecting the same. 

 Nicholson, Journ. IV., 1803, pp. 40-43. 



8. The construction of an apparatus for 



conducting sound and holding conversations at 

 a distance. Nicholson, Journ. IV., 1803, pp. 69- 

 72 ; Gilbert, Annal. XIV., 1803, pp. 220-221. 



9. Letter on the proportion of light afforded 



by candles of different dimensions. Nicholson, 

 Journ. VI., 1803, pp. 90-92. 



10. Improvement by which the additional 

 arc in his reflecting quadrant is rendered un- 

 necessary. Nicholson, Journ. VI., 1803, pp. 

 219-221. 



11. On. the best method of ascertaining the 

 dip at sea. Nicholson, Journ. VII., 1804, pp. 

 62-63 ; Gilbert, Annal. XXIII., 1806, pp. 403- 

 411. 



12. On spectacles, particularly the peri- 

 scopic. Nicholson, Journ. VII., 1804, pp. 291- 

 294. 



13. On the methods of observing the 



longitude at sea. Nicholson, Journ. VIII., 1804, 

 pp."65-70. 



14. On the apparent size of the horizontal 



moon. Nicholson, Journ. IX., 1804, pp. 164- 

 166; X., 1805, pp. 105-111. 



15. On spectacles. Nicholson, Journ. X., 

 1805, pp. 243-245. 



16. On the images formed by convex 



lenses. Nicholson, Journ. X., 1805, pp. 276- 

 277. 



17. On the aberrations of light passing 



through lenses. Nicholson, Journ. XI., 1805, 

 pp. 159-161. 



18. Description of a new Cometarium. 



Tilloch, Phil. Mag. XXIV., 1806, pp. 37-39. 



VOL. VI. 



Walker, Ezckicl. 19. On the apparent magni- 

 tude of the horizontal moon, with new experi- 

 ments. Tilloch, Phil. Mag. XXIV., 1806, pp. 

 240-244. 



2O. On Transit instruments. Tilloch, Phil. 



Mag. XXIV., 1806, pp. 289-290. 



21. A simple way of determining the 



exact time of noon ; also a way to obtain a 

 meridian line on a small scale. Tilloch, Phil. 

 Mag. XXV., 1806, pp. 172-174. 



22. Observations on vision, when terres- 

 trial objects are seen through a mist. Tilloch, 

 Phil. Mag. XXVI., 1806, pp. 29-33. 



23. Description of a new optical machine 



called the Phantasmascope. Tilloch, Phil. Mag. 

 XXVII., 1807, pp. 97-99. 



24. Further remarks on his new Transit 



instrument. Tilloch, Phil. Mag. XXVII., 1807, 

 pp. 287-289. 



. 25. On that power of the eye, by which it 



is adjusted to see objects distinctly at different 

 distances. Tilloch, Phil. Mag. XXIX., 1807, 

 pp. 340-344 ; XXXV., 1810, pp. 82-87. 



26. On the phenomena of the horizontal 

 moon. Tilloch, Phil. Mag. XXIX., 1S07, pp. 

 65-68. 



27. On the cause of the different apparent 



magnitudes of the same objects seen under 

 different circumstances. Tilloch, Phil. Mag. 

 XXX., 180S. pp. 163-165. 



28. On vision. Tilloch, Phil. Mag. XXXI., 



1808, pp. 126-130. 



29. On deal pendulum rods. Tilloch, Phil. 



Mag. XXXIII., 1809, pp. 30-31 ; XXXIV., 



1809, pp. 3-5. 



. 30. On pendulums. Tilloch, Phil. Ma"-. 



XXXVI., 1810, pp. 81-S4. 

 31. On purifying olive oil for the pivots of 



chronometers. Tilloch, Phil. Mag. XXXVI., 



1810, pp. 372-374. 



32. Description of au improved micro- 

 meter. Tilloch, Phil. Mng. XXXVIII., 1811, 

 pp. 127-130. 



33. On variations in the vibrations of 



pendulums. Tilloch, Phil. Mag. XL., 1812, pp. 

 293-294. 



34. Tabular corrections for the rise and 



fall of the mercury in the common barometer. 

 Tilloch, Phil. Mag. XL., 1812, pp. 330-332. 



35. On the geographical position of Lynn, 



in the county of Norfolk. Tilloch, Phil. Mag. 

 XLL, 1813, pp. 331-334. 



36. On electricity. Tilloch, Phil. Mag. 

 XLIL, 1813, pp. 161-163. 



37. On electricity by position or induction. 



Tilloch, Phil. Mag. XLIL, 1813, pp. 215-217. 



38. A short account of some discoveries 



in chemical philosophy. Tilloch, Phil. Mag. 

 XLIL, 1813, pp. 367-371. 



u ii 



