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Usually the image, mat, and glass were then taped together around the edges.Beginning about 1847, a brass frame called a 'preserver' wrapped around the taped assembly.General Rule: The thinner mats and preservers date to late 1850s.
At the height of daguerreotype popularity in 1853, there were reportedly 86 studios in New York City.
The packages are automatically built based on the master branch on github.
Note: The packages are called "openscad-nightly" so it's possible to install the development snapshot packages in parallel to the release version from the official repositories.
Early preservers were fairly plain, usually adorned with simple patterns.
The preserver was prone to breaking at the corners.