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  2. Microscope slide - Wikipedia

    en.wikipedia.org/wiki/Microscope_slide

    A standard microscope slide measures about 75 mm by 25 mm (3″ by 1″) and is about 1 mm thick. A range of other sizes are available for various special purposes, such as 75 x 50 mm for geological use, 46 x 27 mm for petrographic studies, and 48 x 28 mm for thin sections.

  3. 1951 USAF resolution test chart - Wikipedia

    en.wikipedia.org/wiki/1951_USAF_resolution_test...

    A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens.

  4. Pitch of brass instruments - Wikipedia

    en.wikipedia.org/wiki/Pitch_of_brass_instruments

    The modern standard orchestral horn is a double B ♭ /F horn. The player can switch between the two modes using a thumb-operated fourth valve. The fundamental pitch of the F horn is near that of the tuba. Horn notation is a complex subject beyond the scope of this article, but what is written as middle C for the horn is the fourth harmonic of ...

  5. Trombone - Wikipedia

    en.wikipedia.org/wiki/Trombone

    This extends the low range of the instrument and creates the option of using alternate slide positions for many notes. Like the trumpet, the trombone is considered a cylindrical bore instrument since it has extensive sections of tubing that are of unchanging diameter (the slide section must be cylindrical in order to function).

  6. 19-inch rack - Wikipedia

    en.wikipedia.org/wiki/19-inch_rack

    The size denotes the width of the faceplate for the installed equipment. The rack unit is a measure of vertical spacing and is common to both the 19 and 23-inch racks. Hole spacing is either on 1-inch (25 mm) centers (Western Electric standard), or the same as for 19-inch (482.6 mm) racks (0.625 in or 15.9 mm spacing).

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