L, M. Rutherfurd on Astronomical Photography. 305 
diffused the violet rays over a large space, so that in the case 
Paring the summer of 1858 I combined my first stereograph 
we moon, producing quite a satisfactory result with the low. 
vied the stereoscope. I do not know when this was first 
one in England by Mr. De La Rue, but with me the idea was 
ae me of the negatives verify the observation of M. 
tips that the facule are elevations. 
result was a failure and did not give the impression of a 
tte, but presented the appearance of a flat uniform disk 
ftom +...» 2 Spherical net-work which seemed entirely detached 
isk. This is attributable to a want of sufficient detail 
: n. 
binagj ng the year 1859 and for a long time I worked with com- 
“s US Of lenses to be inserted in the tube between the object- 
gee a Plate with the view of correcting the photographie 
* a 018 
mounted equatorially to send by the U. S. Coast Sur- 
edition to Labrador for the observation of the eclipse. 
