Dip
In the context of geology, stratigraphic dip is defined as the maximum angle from the horizontal in the plane of a stratigraphic unit. The direction in which the dip should be measured is known as the dip-direction. If the surface of the unit isn't accessible (for instance, only a cross-section of the unit is visible, as in a cliff-face), only the apparent dip[?] can be measured.In the field, the dip-direction is commonly identified using either a clinometer[?], or by pouring water on the surface of the rock(if it is accessible) and observing the direction of flow. For any inclined surface, there will also be two directions of zero-dip. The direction that is anti-clockwise of the dip-direction is known as the strike.
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portion of the flesh, I should observe that it underwent a very curious
contraction, as it is termed, the parts to which the ends of the fibre
relations of their points of attachment to the centres of motions of
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of these fleshy fibres, which are technically called muscles.html">muscles.
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not at another? Why does one whole group of muscles contract when the
bend it? What is it originates, directs, and controls the motive
physical science, answers this question for us. In the head of the
as nervous substance. Cords of similar matter connect this brain.html">brain of
communicating cords are cut, the brain remaining entire, the power of
is destroyed; and on the other hand, if, the cords remaining entire, the
Whence the inevitable conclusion is, that the power of originating
cords.
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resides in the nerves has been found to be accompanied by a disturbance
we could obtain the value of a given exertion of nerve force by
equivalent; if we could ascertain upon what arrangement, or other
and muscular energies depends (and doubtless science will some day or
ultimate goal in this direction; they would have determined the relation
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