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  2. Probe tip - Wikipedia

    en.wikipedia.org/wiki/Probe_Tip

    Probe tips are also used in the mass spectrometer. Enzymatically active probe tips have been used for the enzymatic degradation of analytes. They have also been used as devices to introduce samples into the mass spectrophotometer. For example, trypsin-activated gold (Au/trypsin) probe tips can be used for the peptide mapping of the hen egg ...

  3. Oblique projection - Wikipedia

    en.wikipedia.org/wiki/Oblique_projection

    The projectors in oblique projection intersect the projection plane at an oblique angle to produce the projected image, as opposed to the perpendicular angle used in orthographic projection. Mathematically, the parallel projection of the point ( x , y , z ) {\displaystyle (x,y,z)} on the x y {\displaystyle xy} -plane gives ( x + a z , y + b z ...

  4. Isometric projection - Wikipedia

    en.wikipedia.org/wiki/Isometric_projection

    Next, the cube is rotated ±45° about the vertical axis, followed by a rotation of approximately 35.264° (precisely arcsin 1 ⁄ √ 3 or arctan 1 ⁄ √ 2, which is related to the Magic angle) about the horizontal axis. Note that with the cube (see image) the perimeter of the resulting 2D drawing is a perfect regular hexagon: all the black ...

  5. Rod and frame test - Wikipedia

    en.wikipedia.org/wiki/Rod_and_frame_test

    Picture 2. An image showing a 10-degree frame angle and a 7-degree rod angle. Observers using the apparatus see the rod as vertically oriented. The frame of the page, image border, etc. make it appear tilted here. The frame of reference with respect to studies of the visual system refers to perceived reference axes. In the rod and frame ...

  6. Perspective distortion - Wikipedia

    en.wikipedia.org/wiki/Perspective_distortion

    Simulation showing how adjusting the angle of view of a camera, while varying the camera's distance and keeping the object in frame, results in vastly differing images. At narrow angles and long distances, light rays are nearly parallel, resulting in a "flattened" image. At wide angles and short distances, objects appear foreshortened or distorted.

  7. Berkovich tip - Wikipedia

    en.wikipedia.org/wiki/Berkovich_tip

    It is a three-sided pyramid which is geometrically self-similar. The popular Berkovich now has a very flat profile, with a total included angle of 142.3° and a half angle of 65.27°, measured from the axis to one of the pyramid flats. This Berkovich tip has the same projected area-to-depth ratio as a Vickers indenter. The original tip shape ...

  8. Square (tool) - Wikipedia

    en.wikipedia.org/wiki/Square_(tool)

    A set square is used in technical drawing, providing a straightedge at a right angle or another particular planar angle to a baseline. They are commonly made from clear plastic. The most common set squares are 45° squares, (one 90° corner and two 45° corners) and 60/30 triangles (a 90°, a 60° and a 30° corner).

  9. Combination square - Wikipedia

    en.wikipedia.org/wiki/Combination_square

    Square, for marking and referencing 90° angles and checking if surfaces are flat and square to one another. Mitre square, for marking and referencing 45° angles, such as in woodworking for mitre joints. Spirit level, to check if a surface is level or similarly if a surface or edge is plumb (vertical). Depth gauge or height gauge.

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