for the Photographic Camera. 321 
rent. I planted the camera and hoped soon to peel off from this 
charming view a cuticle (as Dr. Holmes says) which like plates of 
mica could be split and re-split for the collections of my friends. 
ut on the ground glass I found nought but the tumbling water. 
No rocks, no bridge, no stony river bed—the poor camera in its 
empty head was incapable of taking in the whole of the charm- 
ing picture. One of the dreams of the photographer has been of 
an instrument which should embrace a large angle and thus sat- 
isfy the wants of the eye; but, with the majority of the attempts 
in this direction came other evils, the greatest of which was dis- 
tortion of the marginal lines. The aplanatic lens of Grubble is 
said to comprise an angle of 70°, but in a view before me of 
Trinity College, Dublin, taken with this lens, there is a curvature 
of the straight lines of the roof of more than one-eighth of an inch 
in its length. Mr. Sutton’s panoramic lens, a sphere of glass 
ed with water, includes a very large angle, over 100°, on the 
the picture be bent to the curvature of the plate upon which it 
Was taken, and thus viewed near the centre of the curvature. 
he Harrison and Schnitzer globe lens consists of two achro- 
Matic meniscus lenses placed with their concave sides together, 
and so made that their outer curved surfaces form part of a per- 
fect sphere and the light is admitted through an aperture placed 
midway between the two lenses, 
1e., in the exact centre of the ex- 
tig tpass. The focus of such a 
“0s one and three-quarter inches 
in diameter is two and one-half 
Inches for distant objects, measur- 
as from the surface of the back 
®ns to the ground glass D. The : 
Sircle of light produced is five nes 
‘nches in diameter, and from this ma be cut the oe ork o 
_ Square of a stereoscopic picture. The included angle of light 
' the five inch circle is 75°, and in a three inch square picture 
Cut from it is contained just four times the area of any in- 
Strument I have ever tried, suited to similar work. The re- 
_ narkable property of this lens consists in its absolute correct- 
e oT production If it is used for copying purposes, the 
_ Marginal lines are copied as straight as the originals, and, if — 
