Reversed. Changed about; turned front side to the rear.
Rotative. That which turns, like a shaft. The movement of the
earth on its axis is rotative.
Saturation. Putting one substance into another until it will hold
no more. For instance, adding salt to water until the water
cannot take up any more.
Security. Safety, assuredness that there will be no danger.
Segment. A part eut off from a circle. Distinguished from a
sector, which might be likened to the form of one of the sections
of an orange.
Sexagonal. Six-sided.
Sine of the Angle. The line dropped from the highest point of an
angle to the line which runs out horizontally.
Sinuous. Wavelike; moving up and down like the waves of the
ocean.
Simulates. To pattern or copy after; the making of the like.
Skipper. A thin flat stone.
Spirally-formed. Made like an auger; twisted.
Stability. In airships that quality which holds the ship on an
even and unswerving course, and prevents plunging and side
motions.
Structural. Belonging to the features of eonstruetion.
Strata. Two or more layers; one over or below the other.
Stream line. In expressing the action of moving air, or an
aeroplane transported through air, every part is acted upon by
the air. Stream lines are imaginary lines which act upon the
planes at all points, and all in the same direction, or angle.
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