88 



No. 

 I 



9 



lo 



Mr. Herschel's account of a series of observations 

 Mr. Herschel's observations of the signals seen from Fairlight. 



Third Day, July 13, 1825. 



La Canche 



Wrotham 

 La Canche 

 Wrotham 

 La Canche 

 Wrotham 

 La Canche 

 Wrotham 



La Canche 

 Wrotham 

 La Canche 

 Wrotham 



La Canche 

 Wrotham 

 La Canche 



Wrotham 

 La Canche 

 Wrotham 

 La Canche 



9 31 6-o: 



9 51 iz'5 

 9 56 27*6 



10 6 28-5 



10 II 16-5 



lo 16 i8-i 



10 21 14*1 



Remarks. 

 A thick sea-fog suddenly came 



on 2" before the time, though 



perfectly clear till then. 

 A mere suspicion. Fog thicker, 

 Fog. 

 Fog. 



Very faint, but distinct. Fog clear- 

 Distinct, [ing 

 Object-glasses examined. All co- 

 vered with moisture from the fog, 

 Well observed. Train seen. 

 Perfectly well seen. 



Well seen ; but the glass dim, and 

 the fog coming on again. 



Fog suddenly came on again, and 

 is surprisingly dense, so as 

 scarcely to allow the Mill to be 

 seen ; yet the stars are clear to 

 within 10 degrees of the ho- 

 rizon. 



Fog. 



Fog. 



Fog. 



Fog. 



No. 

 I 



Fourth Day, July 14, 1825. 



La Canche 

 Wrotham 

 La Canche 

 Wrotham 

 La Canche 

 Wrotham 

 La Canche 

 Wrotham 

 La Canche 

 Wrotham 

 La Canche 

 Wrotham 

 La Canche 

 Wrotham 



La Canche 

 Wrotham 



La Canche 

 Wrotham 



26 



31 

 36 



4» 



46 



I 



6 

 II 

 16 



10 21 



10 26 



10 31 



10 36 



10 41 



227 

 151 



15-3 

 i6'4 

 28-1 

 15-2 

 17-4 



15-4 

 ai-5 

 196 

 24-5 

 i8-8 

 25-0 

 15-2 



17-5 

 i8-5 



10 46 27-8 

 10 51 i6-6 



La Canche 10 56 197 

 Wrotham 11 i 17-8 



Remarks. 

 Very distinct ; train seen. 

 A pretty strong breeze. 

 Train perfectly well seen. 



Train seen. 



Train seen, Wind increasing. 



? 23^.5 — am almost sure 2^"'^ is 

 the right. 



Exploded irregularly at half its 



height. 

 Train not seen. N. B. A star in 



the field of the glass. 



First a bright spark; then the 

 train ; then long after, a feeble 

 explosion at 27'. 8. The first 

 flash was brighter than the ex- 

 plosion. 



Train feebly seen. 



Fifth Day, July 15, 1825. 



No. 

 I 

 2 



10 



La Canche 



Wrotham 

 La Canche 

 Wrotham 



La Canche 



Wrotham 



La Canche 

 Wrotham 

 La Canche 



V 



Wrotham 

 La Canche 



Wrotham 



La Canche 

 Wrotham 



La Canche 

 Wrotham 

 La Canche 

 Wrotham 

 La Canche 

 Wrotham 



h. m. s. 

 9 26 30-4 



9 31 22-3 

 9 36 23-4 

 9 41 2y2 



9 46 24*2 



9 56 25*2 

 ID I i8-o:: 

 10 6 23*5 



10 II 23-4 



10 16 i8-i 

 10 16 25-2 



10 21 22'0 

 10 26 22"5 



10 31 25-9 



10 36 25-3 

 10 41 23-3 



10 46 25*4 

 10 51 23-4 

 10 56 21-5 



Remarks. 



The first flash seen at 19'. 4 on 

 lighting the rocket. The flash 

 at 3o"-4 very bright. 



Fainter than the i st flash of No. i . 



A slight flash at lighting. The 

 rocket did not rise. 



A flash at i6'-3 low down. The 

 flash at 24*'2 higher, and to the 

 right of the former. (The teles- 

 cope inverts. N. B.) 



Faint, but very distinct. 



r Signal regular and distinct, but 

 I observation uncertain from a 

 I violent noise in the adjoining 

 L field. ^ 



Sharp and good, but low. 



Feeble and high, to the right of 

 the former. 



{Certainly 'o, but the second un- 

 certain, from a violent noise 

 which drowned the beat of 

 the watch. 

 {Noise continued, and the ob- 

 servations uncertain on ac- 

 count of it. 

 Single explosion ; well observed. 

 Well observed. 



Single explosion ; extremely f. 

 Well observed. 



The train seen. No explosion. 

 The signal not repeated. 



Sixth Day, July 16, 1825. 



No. 

 I 



4 

 5 

 6 



7 

 8 



9 



10 



La Canche 

 Wrotham 



La Canche 



Wrotham 

 La Canche 

 Wrotham 



La Canche 

 Wrotham 

 La Canche 

 Wrotham 

 La Canche 

 Wrotham 

 La Canche 

 Wrotham 

 La Canche 

 Wrotham 

 La Canche 

 Wrotham 

 La Canche 

 Wrotham 



h. m. s. 



9 26 26'3 



9 3' 3»-4 



9 36 i9*» 

 24-3 



9 41 30*0 



9 46 38-0 



9 51 26'I 



10 I 31*6 



10 21 



10 26 

 lo 31 



10 36 

 ID 41 



io 46 



ID 51 



10 56 



11 I 



30-8 

 32*2 



327 

 21-5 



291 

 27*2 



35-9 



i8-2 



299 



296 



297 



Remarks. 

 Extremely faint. 

 The decimal correct, the second 



possibly erroneous from noise. 

 Small bright spark. 

 Broad feeble flash, higher, and to 



the apparent right 

 Exact on the beat. 

 Single bright flash. 

 Explosion distinct but unex 



pected, as it happened before 



the rocket reached its greatest 



elevation. 

 Regular, and well observed. 



Regular, and well observed. 

 Bright single flash. 



Excessively faint. 



Extremely faint. 



Very bright. 



Very bright. Observed with M. 

 Largeteau's glass ; a doubt 

 having arisen as to its correct 

 pointing, he having seen none of 

 the La Canche signals this even- 

 ing- 



