9.1. Accessioned Materials
Accessioned materials represent the permanent records that have been accepted into the archival collection. Once accessioned, these materials receive a range of archival holdings maintenance and archival description. Holdings maintenance enables ongoing preservation. This includes rehousing in acid-free folders and storage boxes, as well as digitizing using archival electronic formats. Description facilitates reference and research. It includes updating finding aids, enhancing cross-references and accomplishing data entry into the archival databases.
9.1.1. Architectural and Engineering Drawings
Beginning with plans for the construction of the U.S. Capitol Building in the early 1800s, and with primary holdings from the 1850s on, the architectural and engineering drawings in the archival collection document a wide range of subjects and contain many formats (e.g., pencil renderings, finely detailed ink and watercolor working drawings, polished presentation pieces, blueprints and modern computer-aided design drawings). These drawings are vital for current construction and maintenance projects, as well as for historic research. The specifications and files on previous projects aid in the planning and development of new projects.
The AOC Archives contain more than 190,000 architectural and engineering drawings with new materials added each year. Approximately 60 percent of these drawings have been digitized and indexed into an internal AOC web-based database to facilitate search and retrieval. The archival staff performs maintenance and basic preservation on the drawings, with specialized work on fragile and historic drawings performed by contracted experts.
9.1.2. Specifications and Other Textual Records
The AOC Archives maintain administrative and project records that document the AOC’s history, as well as the construction history of Capitol campus buildings. These holdings date from the U.S. Capitol extension project in the 1850s and continue through the present. Of special value are the letters from artists and architects dating to the 1850s.
9.1.3. Electronic Archival Records
Electronic records are generated throughout the agency. The records schedules are media-neutral. This means that they apply to both paper and electronic records. The RMAB continues to promote the transfer of permanent electronic records to the archival collection where they may be preserved as heritage assets.
9.2., 9.2.1., 9.2.2., 9.2.3. Preaccessioned Materials
Preaccessioned materials account for all incoming materials that are transferred to the RMAB for the year. This is an important initial quality control step where the materials are screened before the RMAB formally registers the transfer as part of the archival collection. The screening process identifies temporary, duplicative or otherwise nonrecord materials that are not appropriate for accessioning into the archival collection. The process also identifies concerns that may require resolution before the transfer can be completed, such as incomplete transfer documentation, unarranged or partial materials and archival preservation issues.
9.3. Small Architectural Models
The AOC preserves a small number of display models as part of the architectural record for study and possible future exhibit purposes.
9.4. Photographs
The Photography Branch produces photographs relating to architectural design, construction, renovation and restoration of the historic buildings and grounds under the AOC’s care. The Photography Branch covers major ceremonial events, documents works of art and conservation projects and produces graphic slides, displays and video for the AOC and congressional use. The Photography Branch maintains an archive of more than 330,000 photographic images dating to the 1850s. The collection includes approximately 4,000 glass plates, in addition to hundreds of thousands of images in negative, print and digital format. The number of images is growing rapidly since the conversion to digital format. Each unique image is given a control number (one image may exist in multiple formats). The majority of the glass and film negatives are stored off-site for long-term preservation. Digital files are systematically backed up and copied.
2019 PERFORMANCE AND ACCOUNTABILIT Y REPORT
Financial Information • Section III
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