The History and Practice of the Art of Photography by Snelling
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Henry H. Snelling >> The History and Practice of the Art of Photography by Snelling
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"The part of the apparatus which contains the sensitive surface is
an independent frame, and it slides from a dark box into an opening
on the side of the inclined plane.
"A covering of black cloth impermeable to light is, attached to
the sides of the moveable plate, enveloping the whole inclined plane,
rolling freely over two rollers, R, R, placed the one at
the upper and the other at the lower part of the inclined plane.
This cloth prevents the light striking the sensitive surface
before and after the passage of the moveable plate.
"It will be seen that this apparatus enables the experimentalist
to ascertain with great precision the exact length of time
which is required to produce a given amount of actinic change upon
any sensitive photographic surface, whether on metal or paper.
Although at present some calculation is necessary to determine
the difference between the time which is necessary for exposure
in direct radiation, and to the action of the secondary radiations
of the camera obscura; this is, however, a very simple matter,
and it appears to us exceedingly easy to adapt an instrument
of this description to the camera itself.
"By this instrument Mr. Claudet has already determined many
very important points. Among others, he has proved that on
the most sensitive Daguerreotype plate an exposure of .0001
part of a second is sufficient to produce a decided effect.
"Regarding photography as an auxiliary aid to the artist
of no mean value, we are pleased to record a description
of an instrument which, without being complicated, promises to
be exceedingly useful. In this opinion we are not singular;
at a recent meeting of the Photographic Club, to which this
instrument was exhibited, it was with much real satisfaction
that we learned that several of our most eminent artists
were now eager and most successful students in Photography.
The beautiful productions of the more prominent members of this
club excited the admiration of all, particularly the copies of
architectural beauties, and small bits of landscape, by Messrs.
Cundell and Owen. We think that now the artist sees the advantage
he may derive from the aid of science, that both will gain
by the union."
I hope the above description will induce our townsman, Mr. Roach,
to successfully produce an instrument that will meet the wants
of our artists in that part of the Daguerrean process referred to.
FINIS.
INDEX.
Accelerating Liquids. 65
Amphitype. 116
Anthotype. 113
Apparatus. Daguerreotype. 43
Calotype 97
Photogenic 87
Application of Photogenic Drawing. 95
Applying the Sensitive. 64
Bringing out the Picture. 71
Bromine Box. 51
Chloride of 68
Roach's Tripple Compound of 67
water. 65
Bromide of Iodine. 67
of Lime. 68
Paper. 91
of silver. 35
Brushes. 88
Buff Sticks. 60
Calotype process. 97
paper. Exposure in Camera of 100
Pictures. Bringing out ib.
Fixing 101
Camera. Description of the 43
Stand. 49
Woodbridge's ib.
Calotype. 50
Voigtlander 45
Chloride of Bromine. 68
of Gold. 36
to make a solution of 75
of Iodine. 66
of Silver. 31
Chromatype. 112
Chrysotype. 106
Cleaning and Polishing the plate. 61
Coating Boxes. 51
Color Boxes. 53
Colored Daguerreotypes on Copper. 77
Coloring the Picture. 76
Daguerreotypes. 129
Concave Mirrors. 19
Convex Mirrors 19
Corchorus Japonica. 37
Crayon Daguerreotypes. 120
Cyanotype 109
Daguerreotype Apparatus. 43
Process. 61
Plates. 62
Daguerreotypes. Crayon 77
on paper 81
Dedication. iii
Definitions of terms used in optics, 15
Different methods of preparing photogenic paper. 89
Directions for use of Galvanic Battery. 58
Distilled water 88
Drummond light. 128
Dry Sensitive. 68
Drying apparatus. 72
Effects of light on bodies 25
Energiatype 111
Etching Daguerreotypes. 83
Fifth operation. Fixing the picture. 61
First operation. Cleaning the plate 61
Fluoric acid. 69
Fourth operation-Bringing out the picture. 71
Funnels. 53
Galvanic Battery. 57
Solution for use of 58
Gilding stand. 53
the picture. 74
Gold. Chloride of 36
To make solution of 75
Hyposulphite; or Salt of 74
Preparation of. 36
Gurney's Sensitive. 67
Head Rests. 57
Hints and Suggestions. 39
History of Photography. 3
Hungarian Liquid. 69
Hygrometers. 55
Hyposulphite of Gold. 74
of Soda. 28
Instantaneous pictures by means of Galvanism. 77
Introduction. i
Iodine, Dry 64
Chloride of 66
Bromide of 67
Box. 51
Iodide of silver. 32
loduret of silver. 33
Iodize the Plate. To 64
Iodized Paper for Calotypes. To prepare 98
To prepare for the Camera ib.
Lamps, Spirit 53
Light. Theory on 14
Motion of 16
Reflection of 17
Refraction of 20
on bodies. Effects of 25
Prismatic analysis of 22
Lime, Bromide of 68
Lunar Pictures. 127
Mead's Accelerator. 68
Mercury Bath 50
Nitrate of Silver. 89
Oxide of Silver. 29
On coloring Daguerreotypes 129
On the probability of Producing colored Photographs. 123
Paper. blotting; or bibulous, 88
Daguerreotypes. 81
preparation of 89
suitable for Photographs. 87
Photogenic drawing on ib
Photographic principle, the 22
Photographic process on paper. 92
drawing. Application of 95
To fix the 93
deviations. 126
Photographometer, The 135
Plate Support. 59
Blocks. 50
Vice. 51
Poppy, The Red 37
Porcelain dishes. 59
Positive Calotype 104
Preface. v
Preparation of Iodized Paper. 98
of Gold. 36
Prismatic Spectrum. 22
Analysis of Light. ib
Reflection of Light. 17
Refraction of Light. 20
Roach's Tripple Compound of Bromine. 67
Sand Clock. 70
Sealing paper. To make 77
Second operation. 94
Sensitive. ib
Silver. Bromide of 35
Cloride of 31
Iodide of 32
Ioduret of 33
Nitrate of 89
Oxide of 28
Solution of Chloride of 59
Sixth operation. 74
Soda Hyposulphite of 72
Solar and Stellar Light. 21
Still for purifying water, 54
Submitting the Plate to the action of Light 69
Synopsis of Mr. Hunt's Treatise on Light, 29
Talbotype Camera. 50
Theory on Light. 14
Third operation. 69
Wall Flower. 37
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