"It will iKiliirailx' l-.c the jioIkn di ilic ( li^(i\;iiiii\- lo ::|)|)1\ llie 

 lOO-iinh trlcs-opc chirpy to tlif stu;!y of f:!iiU and (lifficull ()l)i('Cts 

 beyond iht' rt'ach of our smaller instrurnrnts. Ilithcito most of the 

 (jhscrvatfons have been made wiih ihc ,ii I (if specto^.aphs attached 

 at the 134 foot focus. Ihc ;;rcal li,L;lu .^allv-ring power permits the 

 spectra of extremely faint stars to be photo^jraphed with moderate 

 exposure In this wa\' the mntinns of faint i-tars in the heart of 

 fjlolnilar clusters and in the star clouds of the Milky Way can he 

 measured. By applying Adams' spectroscopic method of measurinti; 

 the distance of stars, it will also be possible to disinguish between 

 stars that are faint because they are small or feebly luminous and 

 those that are actually bright but are rendered faint by their great 

 distance. 



"A few results already obtained through the study of faint stars 

 with the 100-inch telescope may be of interest. For the first time, 

 except in the case of new or temporary stars, the unknown sas nebul- 

 ium. the most conspicuous of the elements constituting the irregular 

 cloud-like nebulae, has been found to be present in the atmosphere 

 of a star (R Aquarii). This star is a faint reddish object, which 

 varies greatly in brightness in a. period of about a year. 



".\ faint variable star in the constellation Taurus, associated with 

 one of the few nebulae known to vary in brightness, has been found 

 to have an extensive atmosphere in which brilliantly luminous clouds 

 of calcium vapor are conspicuous. Another peculiarity of this star 

 is its extremely high temperature when near its maximum brightness. 



"The faint companions of close double stars, when studied spec- 

 troscopicalh' w-ith the new telescope, have already yislded interest- 

 ing results. Such systems are of great interest in the study of stellar 

 evolution, but the fainter members, especially when very close to 

 their bright companions, have previously been beyond the reach of 

 our spectroscopes. 



■'Thes? examples will suffice to illustrate the present work of the 

 100-inch Hooker telescope, named for the late John D. Hooker of 

 Los Angeles, donor of its optical parts. Several new classes of ob- 

 servations will soon be made with the aid of special appliances now 

 nearing completion." 



