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2. 2-10-10-2 - Wikipedia

   en.wikipedia.org/wiki/2-10-10-2

   The equivalent UIC classification is refined to (1′E)E1′ for Mallet locomotives. All 2-10-10-2 locomotives have been articulated locomotives of the Mallet type. This wheel arrangement was rare. Only two classes of 2-10-10-2 locomotives have been built: the Atchison, Topeka and Santa Fe Railway's 3000 class, and the Virginian Railway's class ...

3. 2-8-8-8-8-2 - Wikipedia

   en.wikipedia.org/wiki/2-8-8-8-8-2

   Under the Whyte notation for the classification of steam locomotives, a 2-8-8-8-8-2 has two leading wheels, four sets of eight driving wheels, and two trailing wheels. Because of its length, such a locomotive must be an multiplex locomotive. It is longer than a normal articulated locomotive; the fourth set of drivers is located under the tender.

4. Half-frame camera - Wikipedia

   en.wikipedia.org/wiki/Half-frame_camera

   It is closer to the normal frame size of a 35 mm motion film. This leaves half frame cameras to derive their film plate size from the aspect ratio, and frame size that was first designated by Thomas Edison (24.89 by 18.67 millimetres or 0.980 by 0.735 inches) at the dawn of the motion picture industry. [1]

5. Photo print sizes - Wikipedia

   en.wikipedia.org/wiki/Photo_print_sizes

   The alternative Super series, denoted SnR, nR Plus or nR+, has an aspect ratio of 3∶2 (or as close as possible) and thus provides a better fit for standard 135 film (35 mm) at sizes of 8 inches or above. 5R is twice the size of a 2R print, 6R twice the size of a 4R print and S8R twice the size of 6R. 4D/6D is a newer size for most consumer ...

6. Superframe - Wikipedia

   en.wikipedia.org/wiki/Superframe

   An extended superframe is 24 frames long, and the framing bit of each frame is used in the following manner: All odd-numbered frames (1, 3, ..., 23) are used for the data link (totalling 4000 bits per second), Frames 2, 6, 10, 14, 18, and 22 are used to pass the CRC total of the previous extended superframe (all 4632 bits, framing and data), and

7. Beam diameter - Wikipedia

   en.wikipedia.org/wiki/Beam_diameter

   For multimodal distributions, the D4σ width is a better choice. For an ideal single-mode Gaussian beam, the D4σ, D86 and 1/e 2 width measurements would give the same value. For a Gaussian beam, the relationship between the 1/e 2 width and the full width at half maximum is = ⁡ =, where is the full width of the beam at 1/e 2. [2]

8. T-slot structural framing - Wikipedia

   en.wikipedia.org/wiki/T-slot_structural_framing

   T-slot framing is divided into metric and fractional (imperial) categories. The T-slot is always centered along the long-axis of the piece. Pieces are available in each series with a square cross-section. Rectangular cross sections are also available which measure x by 2x (where x is the defined width) - e.g. 40mm by 80mm for 40 series.

9. Frame (linear algebra) - Wikipedia

   en.wikipedia.org/wiki/Frame_(linear_algebra)

   A frame is an equal norm frame if there is a constant such that ‖ ‖ = for each . An equal norm frame is a normalized frame (sometimes called a unit-norm frame ) if c = 1 {\displaystyle c=1} . [ 21 ]