_Lining of Cameras._--I find nothing so good to line a camera with as
_black velvet_; for, black the inside of a camera as you will, if it is
hard wood or any size used, there will be reflection from the bottom,
which, with very sensitive plates, gives a dulness which, I think I may
say, is caused by this reflection. I think even the inside of the lens
tube might advantageously be lined with black velvet.