The link below will take you to a directory of assorted useful diagrams and reference data. Most of this information is in the form of GIF images, JPEG images or Acrobat Portable Document Files (PDF).
Many of the files linked above are in Acrobat Portable Document File (.PDF) format. The free Adobe Acrobat Reader software, available from the Adobe website linked below, is required to view or print this type of file. The Acrobat Reader installs itself to operate in two ways:
This file format is independent of computer, operating system, or application programs. PDFs can accurately reproduce highly-formatted pages produced by desktop publishing programs and advanced word processors. Unusual fonts (including non-Latin character sets) used in the original composition are embedded in the file, and will reproduce correctly, even if the font is not present on your system. PDFs can also reproduce smoothly-scalable vector images (not jagged pixelated bitmaps) of technical diagrams produced by CAD, draw and mapping programs without needing the original program. At print time, the image can be automatically re-sized to the actual paper size regardless of the original layout size.
PDFs are created from any program with a "Print" command by the Acrobat "Distiller". This program, part of the full (purchased) version of Acrobat, is a specialized PostScript printer driver that captures print output into a PDF file instead of sending it to a real printer.