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2. Dog (engineering) - Wikipedia

   en.wikipedia.org/wiki/Dog_(engineering)

   Unless the dog is engaged, the gear will simply freewheel on the shaft. This word usage is a metaphor derived from the idea of a dog (animal) biting and holding on, the "dog" name derived from the basic idea of how a dog jaw locks on, by the movement of the jaw, or by the presence of many teeth. In engineering the "dog" device has some special ...

3. Organ replacement in animals - Wikipedia

   en.wikipedia.org/wiki/Organ_replacement_in_animals

   Dogs have eleven blood types but are born without antibodies in their blood. For this reason, first time transfusions will not have a reaction, but further transfusions will cause severe reactions if the dog has a mismatch in the DEA1.1 blood type. Because the immune systems of dogs are so fierce, cross-match tests must be performed upon each ...

4. Electromagnetic clutches and brakes - Wikipedia

   en.wikipedia.org/wiki/Electromagnetic_clutches...

   Similarly, two-piece brakes that have separate armatures should be burnished on a machine rather than a bench because any change in the mounting tolerance as that brake is mounted to the machine may shift the alignment so the burnishing lines on the armature, rotor or brake face may be off, slightly preventing that brake from achieving full torque.

5. Rotating reference frame - Wikipedia

   en.wikipedia.org/wiki/Rotating_reference_frame

   A rotating frame of reference is a special case of a non-inertial reference frame that is rotating relative to an inertial reference frame. An everyday example of a rotating reference frame is the surface of the Earth. (This article considers only frames rotating about a fixed axis. For more general rotations, see Euler angles.)

6. Drum brake - Wikipedia

   en.wikipedia.org/wiki/Drum_brake

   Drum brake (upper right) with the drum removed (lower left, inside facing up), on the front of a Ford Falcon Sprint A rear drum brake on a Kawasaki W800 motorcycle. A drum brake is a brake that uses friction caused by a set of shoes or pads that press outward against a rotating bowl-shaped part called a brake drum.

7. Cat righting reflex - Wikipedia

   en.wikipedia.org/wiki/Cat_righting_reflex

   The cat righting reflex is a cat's innate ability to orient itself as it falls in order to land on its feet. The righting reflex begins to appear at 3–4 weeks of age, and is perfected at 6–9 weeks. [1] Cats are able to do this because they have an unusually flexible backbone and no functional clavicle (collarbone). The tail seems to help ...