Evening Elegy.—Poetical Calendar.
Harleian Miscellany, vol. viii.
PHOTOGRAPHIC CORRESPONDENCE.
Photographic Exhibition.—We understand that the Photographic Society has made arrangements for an exhibition of photographs in the metropolis during the months of January and February next. The exhibition will not be confined to the works of native photographers, but will comprise specimens of the most eminent foreign artists, who have been specially invited to contribute. From the advances which have been made in this favourite art, even since the recent exhibition in the rooms of the Society of Arts, we may confidently anticipate that the display on the present occasion will be one of the highest interest.
How much Light is obstructed by a Lens?—Can any of your scientific correspondents furnish me with an approximation to the quantity of light which is transmitted through an ordinary double achromatic lens, say of Ross, Voightlander, or any other celebrated maker?
Lux.
Stereoscopic Articles.—I cannot agree to my opponent's assumed amendment (?) (Vol. viii., p. 419.) space, for the simple reason that it would be virtually abandoning the whole of the points in dispute between us; when farther discussion and more mature consideration, only tend to convince me more firmly of the correctness of the propositions I have advocated, viz.:
1st. That circumstances may and do arise in which a better result is obtained in producing stereographs, when the chord of the angle of generation is more or less than 2½ inches.
2nd. That the positions of the camera should not be parallel but radial.