Page:Madras journal of literature and science vol 2 new series 1857.djvu/263

JULY— SEPT. 1857.] Stereoscopic Porlraiis. 253 This might be said of almost any book, I suppose every book, of the kind. What is a learner to do who has no better materials? It is destructive for a learner to use a book, when he is not sure whether the sentences are Tamil or not.

I mention these particulars of this book, as illustrative of the mistakes, and undigested ideas that are current on the subject.

(Communicated to the Madras Photographic Society and by them to the Journal for publication).

Thinking it may be useful to Photographers who wish to take Portraits for the Stereoscope, but who have only a common Camera I send the plan of an addition by which this may be done.

As very nice work is not required, it may be made by an ordi- nary carpenter and at a very slight expense. The time taken to do both pictures is but little above that required for the two ex- posures. The back of the Camera B. re- mains unaltered with the exception of thin strips of wood c. c. which are attached to it to receive a thin screen S. which sepa- rates the pictures : the length of the screen depends on the focus of the Lenses. There should be as little interval between it and the exposing frame at one end, and the back line of the combination on the other as possible.

The front of the Camera required may be made of teak wood in