VISUAL, GRATING AND GLASS-LENS, SOLAR SPECTRUM. 



535 



Now these latter were thus :— 



First Winchester Solar Spectrum, 1884. 



1 



1 















Hours of 





Portions of 

 Spectrum in 

 W. N. Place. 



Day of 

 Observation. 



Order of 



Grating's 



Spectrum 



used. 



Coloured Glass 



Screens employed in 



front of Slit. 



Max. Shade 



Temp, in 



Observing 



Room. 



Water-gas 

 in Cubic 



Foot of Air, 

 outside. 



Forenoon 



Sun-shine 



by Col. 



Knight's 



Notes at the time. 

















Recorder. 















°F. 



Grains. 



H. 



M. 





33,000-35,000 



g 



June 25 



1st 



two blue 



70-0 



5-2 



1 



52 



Between openings of 

 clouds only. 



35,000-36,500 



c? 



June 24 



1st 



1 blue + 1 red 



67'0 



3 6 



4 



15 



Violet lines of 2nd order 

 intrude. 



36,000-39,700 



« 



June 23 



2nd 



lred 



68'3 



4'2 



5 



8 



Blue lines of 3rd order 

 intrude. 



39,700-43,050 



o* 



June 24 



2nd 



None 



67'0 



3 6 



4 



15 



Definition exquisite, no 

 coloured glasses. 



43,050-46,830 



n 



June 12 



2nd 





68'0 



4-6 



4 



57 





46,830-48,150 



h 



June 14 



2nd 





69-7 



4'3 



2 



46 





48,150-49,630 



d 



June 16 



2nd 





62'5 



3'5 



1 



21 





49,630-50,000 



$ 



June 18 



2nd 





64'5 



4 



1 



52 





50,000-55,850 



il 



June 19 



2nd 





66'4 



4'0 



3 



9 



Focus of Collimator thus 

 far mitoucbed. 



55,850-58,950 



9 



June 20 



2nd 



1 blue 



67-0 



4'6 



5 



34 



Afterwards moved simi- 

 larly to telescope's focal 

 adjustment, but to half 

 the amount only, and 



58,950-60,600 



h 



June 21 



2nd 



1 blue 



66'0 



4-4 



3 



59 



at frequent intervals. 



60,600-62,950 



<L 



June 23 



2nd 



1 blue 



68 3 



4'2 



5 



8 





Second Winchester Solar Spectrum, 1884. 

















Hours of 





Portions of 

 Spectrum in 

 W. N. Place. 



Day of 

 Observation. 



Order of 



Grating's 



Spectrum 



used. 



Coloured Glass 



Screens employed in 



front of Slit. 



Max. Shade 



Temp, in 



Observing 



Room. 



Water-gas 

 in Cubic 



Foot of Air, 

 outside. 



Forenoon 



Sun-shine 



by Col. 



Knight's 



Notes at the time. 

















Recorder. 















•F. 



Grains. 



H. M. 





33,000-34,400 



9 



June 27 



1st 



2 blue + 1 red 



73-4 



5-0 



6 12 





34,400-43,050 



h 



June 28 



2nd 



1 blue + 1 red 



76'0 



4-9 



5 30 



The last part of the way, 



43,050-47,700 



9 



June 13 



2nd 



None 



73-0 



4-8 



6 4 



1 red glass only. 



47,700-58,900 



V 



June 26 



2nd 



None 



72'0 



3'7 



6 56 



A marvellous three days 

 for nearly continuous 

 sun-shine, viz., 11, 9 

 and \. Says Col. 



58,900-62,900 



9 



June 27 



2nd 



1 blue 



73-4 



5-0 



6 12 



Knight, " It cannot 

 last ! " And it did not. 







Third Winchester Solar Spectrum, 1884. 

















Hours of 





Portions of 

 Spectrum in 

 W. N. Place. 



Day of 

 Observation. 



Order of 



Grating's 



Spectrum 



used. 



Coloured Glass 



Screens employed in 



front of Slit. 



Max. Shade 



Temp, in 



Observing 



Room. 



Water-gas 

 in Cubic 



Foot of Air, 

 outside. 



Forenoon 

 Sun-shine 

 by Col. 

 Knight's 



Notes at the time. 

















Recorder. 















F. 



Grains. 



H. M. 





33,000-36,500 



% 



July 3 



1st 



2 blue + 1 red 



73-0 



5'4 



6 45 



Little "a" in immense 

 force. 



36,000-41,750 



H 



July 3 



2nd 



1 red 



73-0 



5'4 



6 45 





41,750-44,650 



9 



July 4 



2nd 



1 orange 



73'5 



5 '2 



3 40 



All between clouds. 



44,650-50,000 



(! 



July 7 



2nd 



1 green 



68'5 



4-6 



3 14 





50,000-55,320 



A 



July 8 



2nd 



1 blue 



71'8 



5'0 



3 2 





55,320-56,000 



9 



July 9 



2nd 



1 blue 



70-5 



5-6 



18 



Through clouds. 



56,000-58,100 



U 



July 17 



2nd 



1 blue 



66'8 



4-7 



1 27 



Through clouds more or 

 less. 



58,100-60,700 



9 



July 18 



2nd 



1 blue 



66-4 



3-8 



3 31 



Through clouds more or 



60,700-63000 



h 



July 19 



2nd 



1 blue 



66-0 



3'5 



4 2 



Between clouds, and with 

 lower eye-piece. 



VOL. XXXII. PART III, 



4 T 



