630 



The Earl of Bosse 



[May 31, 



Slide 8 represents in section the telescope with the apparatus 

 attached. The concentration on a surface of one-third of an inch 

 circular is equal to 5700 times, allowing for loss of light by reflection 



Fig. 11 





Fig. 12. 



of the surfaces of the two mirrors. Slide 9 gives an enlarged section 

 at the box with the thermopiles and the concave reflectors. 



In Slides 10, 11, 12 we have views of the telescope and apparatus. 



