Furthermore, during CO oxidation, these reaction rate non-uniformities were found to propagate back and forth in the direction of the gas flow.
Move the electric sander back and forth in the direction of the wood grain until you have sanded your entire surface.
(you can make 'hinge' by cutting a square from a plastic lid and folding in half) The hinge should go back and forth in the direction of the front and back of the dispenser.
There was a rush from the Mets dugout, and as Piazza was being tended to, Valentine walked back and forth, glancing in the direction of Clemens.
S waves, also called shear or transverse waves, cause points of solid media to move back and forth perpendicular to the direction of propagation; as the wave passes, the medium is sheared first in one direction and then in another.
When an earthquake occurred, balls were released from a dragon's mouth, probably by an internal pendulum that moved back and forth according to the direction of vibration, and were caught by a frog's mouth, which produced noise.
"Go forth boldly in the direction of your dreams; live the life you've imagined".
The six-week courses, at the recently established Scottish Marine Station at Granton on the Firth of Forth, were under the direction of Patrick Geddes and John Arthur Thomson, and included sections on botany and practical zoology.
P waves, also called compressional or longitudinal waves, give the transmitting medium whether liquid, solid, or gas a back-and-forth motion in the direction of the path of propagation, thus stretching or compressing the medium as the wave passes any one point in a manner similar to that of sound waves in air.
The annual parallax is the tiny back-and-forth shift in the direction of a relatively nearby star, with respect to more-distant background stars, caused by the fact that Earth changes its vantage point over the course of a year.
