449 
SCIENTIFIC SUMMARY. 
leading us to suppose that the eclipse has been very successfallj observed, 
and some very important photographs secured. It is understood that 
several plates were exposed with success by Major Tennant’s party, and that 
a large measure of success has rewarded the North German Expedition at 
Aden, who secured three negatives of great value. 
A Neiv Camera. — Mr. Edward B. Tennessy gives, in the Illustrated Photo- 
grapher, the following description of a new camera of a very portable and 
complete kind : — The covers, BB, of the double circular dark frame, A, are 
hinged at II H, the end of each hinge being allowed to project, so that on 
pushing the frame into the camera, a notch, N, left in the thickness of the 
camera, catches those projections and causes the covers to open. Before 
withdrawing the frame, it is turned so that the projection of the hinge fits 
into the groove, S, fig. 3 j then, on pulling back the frame, the slide rises and 
A 
shuts. It is then turned back and withdrawn. The cover is retained suf- 
ficiently tight by the stiffness of the hinge, which could, if necessary, be 
assisted with a spring somewhat like that employed in the covers of 
watches ; but if this arrangement of opening and shutting be considered 
inconvenient, it is easy enough to contrive a small pin and handle for the 
purpose. The covers or flaps, B B, are made of india-rubber, leather, thin 
brass, felt, or any such elastic material. They are fixed with studs to the 
brass arm, K, and when opened inside the camera, accommodate themselves 
to its conical body. The walking-stick tripod requires no further notice 
than to remark that the ball is permanently retained in the handle, the 
