What is PDF?
What the PDF Files Include
Accessing the Pages in PDF
PDF is described on the Adobe Acrobat site as follows: "PDF is an acronym for "Portable Document Format. PDF is a file format created by Adobe that lets you view and print a file exactly as the author designed it, without needing to have the same application or fonts used to create the file" Additional information about PDF is available from the Adobe Acrobat site.
On this site, the PDF files are acting as a carrier for images of the original documents - that is, an image of the page is embedded in the PDF file. Unlike other PDF files, it is not possible to search on the text within the files. These embedded images are TIFF images compressed using Group 4 (CCITT) compression techniques.
For each issue of a journal on the site one or more PDF files, consisting of between 1 and 10 pages, have been created from the TIFF files. The number of pages in each files depends on 1) the number of pages in an issue; and 2) the approximate size in kilobytes of each page once converted. If the total size of the PDF file is likely to substantially exceed 1 megabyte, then the number of pages per file has been adjusted where possible to ensure that the PDF file sizes are kept at approximately 1 megabyte or less. Please note however that for some titles processed early in the Project; the file sizes may be as large as 2 or more megabytes.
The original TIFF files were named during digitisation so that different categories of pages could be easily identified in any automated processes. For example, a file named 0001000c.tif indicates that this page is the first physical page of an issue (the first four characters=0001) , and in this case it is the cover page for the journal (the second 4 characters=000c). 00040001.tif indicates that this is the fourth physical page in the issue, but it is page number 1 in this issue of the journal. Pages with roman numbering, indexes, prefaces and supplements are also identified in the file naming conventions used for the TIFF files.
The PDF files have been named according to the first four characters in the TIFF file names - i.e. the physical numbering for each journal issue. e.g. 1-10.pdf
The filenaming used for the TIFF files has allowed the automated processes used to generate the pages containing the lists of issues available to specify exactly what the actual pagination on the issue of the journal was. For example:
Colonial literary journal and weekly miscellany of useful information
- Volume 1, Number 1 (June, 1844)
- Page iv
- Index vi-vii
- Page 1-3
- Page 4-13
- Page 14-17
- Volume 1, Number 2 (4 June, 1844)
- Page 18-26
- Page 27-32
It should be noted here that even though each category of page is listed, the number of pages in a PDF file does not necessarily correspond. For this example, the Cover, Preface, Page iv, Index, Index vi-viii and Page 1-3 are all included in the first PDF file which includes the first 10 physical pages of the journal. After opening the file 1-10.pdf using one of these first 6 links, it will still be necessary to navigate through the file to find the preface, index, roman pages, or pages 1, 2 and 3.
Further information about opening and navigating the PDF files is available in: Help - Using the Acrobat Reader
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