The method of casing objects using a protective cover glass bound to the object using a tape or f... more The method of casing objects using a protective cover glass bound to the object using a tape or frame promotes glass corrosion on the inside surface of the cover glass in preference to the outside surface. The characterization of some of the corrosion products found on these glasses is discussed especially as it applied to cased! daguerreotypes. The geometry of these packages is responsible for the corrosion phenomenom. The types of corrosion products and the severity of the corrosion is a function of the bulk composition of individual cover glasses.
... in-Publicadon Data Barger, M. Susan, 1949-The daguerreotype : nineteenth-century technology a... more ... in-Publicadon Data Barger, M. Susan, 1949-The daguerreotype : nineteenth-century technology and modern science / M. Susan Barger and ... 32 4.3. View of the Central High SchooL Philadelphia. ... Daguerreotype of a laboratory, the Academy of Natural Sciences of Philadelphia. ...
In 1987, a major effort to understand the effects of resizing treatments on naturally aged papers... more In 1987, a major effort to understand the effects of resizing treatments on naturally aged papers was begun at The Johns Hopkins University (Baltimore, USA). This article presents a visual dictionary of characteristic changes in paper surface morphology caused by different resizing agents (gelatine, Klucel G, methyl-cellulose, parylene, starch, parchment size). In general, individual resizing agents are associated with typical surface structures that are related to the rheological characteristics of the resizing solutions, the surface topography of the treated papers, and the original fiber and size content of the papers before treatment.
The proposed physical model for Daguerreotypes was tested by quantitative reflectance measurement... more The proposed physical model for Daguerreotypes was tested by quantitative reflectance measurements using a goniophotometer. The device allowed the angle of incidence of the illuminant and the angle of viewing of the detector to be varied independently. The results were consistent with the model which explains the observed contrast in Dagueneotypes as the balance between diffuse reflectance in highlight areas (those with the most exposure) and specular reflectance in shadow areas. Thin corrosion films added an undulatory pattern to the reflectance curves. Thicker corrosion films, scratches, and damage due to cleaning produced more complicated structure in the reflectance curves and also reduced the separation between the highlight and shadow area curves. These results are in agreement with the visually reduced contrast. See also AATA 21-1122 and 21-1124.
... in-Publicadon Data Barger, M. Susan, 1949-The daguerreotype : nineteenth-century technology a... more ... in-Publicadon Data Barger, M. Susan, 1949-The daguerreotype : nineteenth-century technology and modern science / M. Susan Barger and ... 32 4.3. View of the Central High SchooL Philadelphia. ... Daguerreotype of a laboratory, the Academy of Natural Sciences of Philadelphia. ...
... in-Publicadon Data Barger, M. Susan, 1949-The daguerreotype : nineteenth-century technology a... more ... in-Publicadon Data Barger, M. Susan, 1949-The daguerreotype : nineteenth-century technology and modern science / M. Susan Barger and ... 32 4.3. View of the Central High SchooL Philadelphia. ... Daguerreotype of a laboratory, the Academy of Natural Sciences of Philadelphia. ...
Astronomers and photographers have been combining their efforts since the early 1800s in France. ... more Astronomers and photographers have been combining their efforts since the early 1800s in France. At the time, astronomers were mapping the sky, which required precise measurements. Photography was seen as a way to eliminate human error in the calculations. It took years of work at the Harvard College Observatory using the Great Refractor, then the largest telescope in the world,
Journal of the American Institute for Conservation, 1984
ABSTRACT In certain instances, it may be desirable to protect a daguerreotype from corrosion by t... more ABSTRACT In certain instances, it may be desirable to protect a daguerreotype from corrosion by the application of a surface coating. Protective coatings must be both chemically and physically non-reactive with the daguerreotype image material, and, more importantly, must not interfere with the optical properties of daguerreotypes. Sputtered coatings such as silicon dioxide, boron nitride, lanthanum hexaboride, aluminum nitride, and titanium dioxide, as well as a vapor-deposited polymeric coating, Parylene C, have been tested. The results of these tests are discussed.
 study of SI implanted with oxygen using spectroscopic eilipsometry PJ McMarrandБ.J. Mrstik Nava... more  study of SI implanted with oxygen using spectroscopic eilipsometry PJ McMarrandБ.J. Mrstik Naval Research Laboratory, Code 6810, Electronics Science and Technology Division, Washington, DC 20375-5000 M. S. Barger and Q. Bowden Department of Materials ...
The method of casing objects using a protective cover glass bound to the object using a tape or f... more The method of casing objects using a protective cover glass bound to the object using a tape or frame promotes glass corrosion on the inside surface of the cover glass in preference to the outside surface. The characterization of some of the corrosion products found on these glasses is discussed especially as it applied to cased! daguerreotypes. The geometry of these packages is responsible for the corrosion phenomenom. The types of corrosion products and the severity of the corrosion is a function of the bulk composition of individual cover glasses.
... in-Publicadon Data Barger, M. Susan, 1949-The daguerreotype : nineteenth-century technology a... more ... in-Publicadon Data Barger, M. Susan, 1949-The daguerreotype : nineteenth-century technology and modern science / M. Susan Barger and ... 32 4.3. View of the Central High SchooL Philadelphia. ... Daguerreotype of a laboratory, the Academy of Natural Sciences of Philadelphia. ...
In 1987, a major effort to understand the effects of resizing treatments on naturally aged papers... more In 1987, a major effort to understand the effects of resizing treatments on naturally aged papers was begun at The Johns Hopkins University (Baltimore, USA). This article presents a visual dictionary of characteristic changes in paper surface morphology caused by different resizing agents (gelatine, Klucel G, methyl-cellulose, parylene, starch, parchment size). In general, individual resizing agents are associated with typical surface structures that are related to the rheological characteristics of the resizing solutions, the surface topography of the treated papers, and the original fiber and size content of the papers before treatment.
The proposed physical model for Daguerreotypes was tested by quantitative reflectance measurement... more The proposed physical model for Daguerreotypes was tested by quantitative reflectance measurements using a goniophotometer. The device allowed the angle of incidence of the illuminant and the angle of viewing of the detector to be varied independently. The results were consistent with the model which explains the observed contrast in Dagueneotypes as the balance between diffuse reflectance in highlight areas (those with the most exposure) and specular reflectance in shadow areas. Thin corrosion films added an undulatory pattern to the reflectance curves. Thicker corrosion films, scratches, and damage due to cleaning produced more complicated structure in the reflectance curves and also reduced the separation between the highlight and shadow area curves. These results are in agreement with the visually reduced contrast. See also AATA 21-1122 and 21-1124.
... in-Publicadon Data Barger, M. Susan, 1949-The daguerreotype : nineteenth-century technology a... more ... in-Publicadon Data Barger, M. Susan, 1949-The daguerreotype : nineteenth-century technology and modern science / M. Susan Barger and ... 32 4.3. View of the Central High SchooL Philadelphia. ... Daguerreotype of a laboratory, the Academy of Natural Sciences of Philadelphia. ...
... in-Publicadon Data Barger, M. Susan, 1949-The daguerreotype : nineteenth-century technology a... more ... in-Publicadon Data Barger, M. Susan, 1949-The daguerreotype : nineteenth-century technology and modern science / M. Susan Barger and ... 32 4.3. View of the Central High SchooL Philadelphia. ... Daguerreotype of a laboratory, the Academy of Natural Sciences of Philadelphia. ...
Astronomers and photographers have been combining their efforts since the early 1800s in France. ... more Astronomers and photographers have been combining their efforts since the early 1800s in France. At the time, astronomers were mapping the sky, which required precise measurements. Photography was seen as a way to eliminate human error in the calculations. It took years of work at the Harvard College Observatory using the Great Refractor, then the largest telescope in the world,
Journal of the American Institute for Conservation, 1984
ABSTRACT In certain instances, it may be desirable to protect a daguerreotype from corrosion by t... more ABSTRACT In certain instances, it may be desirable to protect a daguerreotype from corrosion by the application of a surface coating. Protective coatings must be both chemically and physically non-reactive with the daguerreotype image material, and, more importantly, must not interfere with the optical properties of daguerreotypes. Sputtered coatings such as silicon dioxide, boron nitride, lanthanum hexaboride, aluminum nitride, and titanium dioxide, as well as a vapor-deposited polymeric coating, Parylene C, have been tested. The results of these tests are discussed.
 study of SI implanted with oxygen using spectroscopic eilipsometry PJ McMarrandБ.J. Mrstik Nava... more  study of SI implanted with oxygen using spectroscopic eilipsometry PJ McMarrandБ.J. Mrstik Naval Research Laboratory, Code 6810, Electronics Science and Technology Division, Washington, DC 20375-5000 M. S. Barger and Q. Bowden Department of Materials ...
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