348 Dr. M^ Keeper on tlie Influence of Solar Light [Nov. 





to ^Ti^y Bdi vlA 



-oliffq io'nifi if'^ 

 lo anoieuloric 



-gudrm^o 1 



aidT 



Mbb ifidj Ifij diivf 

 nao&d'i f jBoidqo<r 

 .iaaiajni saiu 



, ((i jfraizs ale 

 n^i iBfuqoi, 



^' tBd 



jj aaqo 



nkibixoat 



-Lb wiiGm U 



io ashidfljsjjj^ 



^ ojuijsn 1, ida9C 



tfboiioq lli^ ^u dYid897q oj sb o 



jjii i ijil 



odl to a 



^aohBaldalO'J dim 



igfiv odj tadi ^^d 



-oiq §nii6'iorx9J3b awoh^y 



^'ladqaoixiJB odi o> b9'ioJr<3i u, 



io<9JjB4afi iaohsuHa (lof^ m bn 



I then placed a prism moveable on its axis before an opening 

 in the window shutter, so that the sun's rays should fall on it at 

 right angles, and having got the spectrum stationary on the 

 pasteboard, I allowed the rays of one colour only to pass at a 

 time. A piece of green taper, accurately marked after the usual 

 manner, was now ignited, and submitted to different Wttiptisbf 

 the spectrum with the following results : !"^ f:- mci naa 



boniinoo nadv/ jdoK U , ;/. ij .^^f^o^i^}ifi^e^tjf(Q inches of ta^or^j^ 



wus'ioN^'ife the red ray it took .^.^^^'f •-^ J^i^k^ ;^'Mf(ttoxmb^ ns a 



ZB 8B2 fiygo-ij , . green ray .., ,.,^. ^m^.. .^^^ji, S.,,;?!); baifiJsaa" 



violet ray 8" 39 ^ 



Twoloo ziffj j^nih/in <: Verge of violet ray -.^tfw.tffi tu . . 8 57 •,ft* v. nobiof, 



"' eotmadiUDmg with the violet ray, the loss was as follQWBidl'jijaji. 



'^!^WW^^P^^^^ liavihgl>een tecAvil^^<^mm^^m;mli]k^^^^^ 

 jKftw^v?coIours were legible at the following distahceSV ' *^ -' '^> y"n"<f>o sHi nT 

 "» "=»^ zr •''' «>,•.. . ,;/;/i7})r. od Jilj^im alqio 



brw oifLHbli ; : lo tlie yiplet ray at^ . . .,, . ,.,;., ^ .^d,.f,:j-; J^WcJ^iomoq lajuaig od: 

 JWQoaib OJ xIi^9T 9-inm ijnA j ^ W »*»»>N >t>f W» ^h^ xir^ w o-(;»li «k<M3 -{Km ,iwo[o3 ^nitlfi^■A^^ 

 9maf. 9rfT ,ji ^d fwri^tfqWlie)* Ji<m> aww^jrl y<i«M ^♦'.♦lT>♦'> «#>>« Afiir j/j;q3i Lajaow liarit 



ff^HqmowBOJ l»'(o(qfff'> tfveea 4(»*J»k;<»«U •wif*.Wfi4io'l4$,l)aad a/b ai Jnoga alqmi^' 



deep yellow ..*.j>.(jMj "Jo ^( Jiii« v JaaJasig sif i 



n'>^7/o ^jjw ^Ino Jon I)agid«Mi«irbo»)-k*f»irK>r».*f^f(f(^r^>..*ii /^kifh bnj/i>i 3io?,3ii«8 + 



