US101728A - Improvement in photographic printing apparatus - Google Patents
Improvement in photographic printing apparatus Download PDFInfo
- Publication number
- US101728A US101728A US101728DA US101728A US 101728 A US101728 A US 101728A US 101728D A US101728D A US 101728DA US 101728 A US101728 A US 101728A
- Authority
- US
- United States
- Prior art keywords
- improvement
- photographic printing
- printing apparatus
- tubes
- printing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000007639 printing Methods 0.000 title description 10
- 230000000694 effects Effects 0.000 description 4
- 229910052573 porcelain Inorganic materials 0.000 description 4
- 150000001768 cations Chemical class 0.000 description 2
- 230000000875 corresponding Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
Images
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B27/00—Photographic printing apparatus
- G03B27/02—Exposure apparatus for contact printing
- G03B27/04—Copying apparatus without a relative movement between the original and the light source during exposure, e.g. printing frame or printing box
- G03B27/06—Copying apparatus without a relative movement between the original and the light source during exposure, e.g. printing frame or printing box for automatic repeated copying of the same original
Definitions
- This invent-ion relates to improvements in apparatus for making mezzotint photographs, and consists in the employment of a large box containing several square tubes, and supported on pivots in a frame mounted on casters, so that it may be adjusted in vertical and horizontal planes, to cause the tubes to receive'the rays of light from the sun in the lines of their axes at all times, and so as to fall on the negative perpendicular to it, the negative with the printing-frame being placed at the bottom of the tubes.
- Figure 1 is a iiont elevation of my improved apparatus
- Figure 2 is a sectional elevation of the same.
- A is the box containing the square tubes B, and mounted on pivots C in the upper ends of the parts D, which rise up from a stand, E, mounted on three or more casters, F.
- G represents curved slotted projecting plates, placed in the sides of the box for securing it at any point of rotation on its horizontal axis by the screw and thumbnut H.
- I represents pockets at the bottom of the tubes, in which the printing-board is placed.
- the light may be always caused to fall upon the negatives perpendicular to' their planes.
- '.lhese tubes which are the size of the negatives, cut olf all reflected or diffused light, and, by reversing the negative, or placing a glass between it and paper, a beautiful effect is produced, without impairing the definition.
Description
attent (Itjlitc.
JAMES n. HAMILTON.
0F -SIOUX CITY, IOW-A.
Letters Patent No. 101,728, dated April 12, 1870.
IMPROVEMENT IN PHOTOGRAPHIC PRINTING APPARATUS.
The Schedule referred to in the Letter: Patent and making part of the same.
This invent-ion relates to improvements in apparatus for making mezzotint photographs, and consists in the employment of a large box containing several square tubes, and supported on pivots in a frame mounted on casters, so that it may be adjusted in vertical and horizontal planes, to cause the tubes to receive'the rays of light from the sun in the lines of their axes at all times, and so as to fall on the negative perpendicular to it, the negative with the printing-frame being placed at the bottom of the tubes.
Figure 1 is a iiont elevation of my improved apparatus, and
Figure 2 is a sectional elevation of the same.
Similar letters of reference indicate corresponding parts.v
A is the box containing the square tubes B, and mounted on pivots C in the upper ends of the parts D, which rise up from a stand, E, mounted on three or more casters, F.
G represents curved slotted projecting plates, placed in the sides of the box for securing it at any point of rotation on its horizontal axis by the screw and thumbnut H.
I represents pockets at the bottom of the tubes, in which the printing-board is placed.
It will be seen that by turning the box on its axis,
` and the stand on the casters, the light may be always caused to fall upon the negatives perpendicular to' their planes.
'.lhese tubes, which are the size of the negatives, cut olf all reflected or diffused light, and, by reversing the negative, or placing a glass between it and paper, a beautiful effect is produced, without impairing the definition.
Besides ordinary work, it is valuable for printing porcelain pictures, which, owing to ine-qualities inthe surfaces of the negatives and porcelain plates, makes it almost impossible with the ordinary method of printing to 4produce a sharp picture, the contact being imperfect. With this apparat-ns this diiculty is removed.
In copying photographs, the, roughness of the paper which produces such a disagreeable effect in the ordinary method of print-ing is removed, and the copy has all the smoothness and rouuduess of a picture taken from life, and in landscape photography many beautiful eiiects can be produced, not attainable in any other way.
Having thus described my invention,
I claim as new and desire to secure by Letters Patent- A photographic printing-case, A, provided with the tubes B and pockets I, and mounted on'a stand, so as to oscillate vertically and horizontally, as herein shown and described.
The above specin'cation of my invention signed by me this 14th day of February, 1870.
JAMES H. HAMILTON.
Witnesses:
A. l, WILGosKI,
GHAs. GANDENBERGER.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US101728A true US101728A (en) | 1870-04-12 |
Family
ID=2171203
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US101728D Expired - Lifetime US101728A (en) | Improvement in photographic printing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US101728A (en) |
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0
- US US101728D patent/US101728A/en not_active Expired - Lifetime
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