1.] 



A SIMPLE EXPERIME 



get what is called a continuous spectrum, that is, a spectrum 

 in which there is light of every degree of refrangibility with no 

 gaps or spaces. 



The experiment indicated in the accompanying figure is one 

 which anybody may make for himself or herself. We want 

 a candle, and an ordinary lustre or prism placed as shown, at 

 least twenty inches from the candle and on the same level. 

 Then bearing in mind the fact that the beam is refracted or 

 turned out of its course by the prism, we must place the eye, 



Prism 



CancfJe 



FIG 4. 



not in the direct path of the light, but as indicated. We then get 

 no longer an image of the candle, but a spectrum, presenting 

 the series of colours in the following order proceeding from right 

 to left : 



1 I 



O >H 



o> 

 to 



This we may show graphically by representing these colours 

 by their initials : 



using open letters to show that it is a case of giving out of light. 



