A boiler with horizontal sections is shown in fig.
It has the horizontal racking motion mentioned FIG.
In the last case the mother-cell divides by a number of horizontal walls.
Lind's anemometer, which consists simply of a U tube containing liquid with one end bent into a horizontal direction to face the wind, is perhaps the original form from which the tube class of instrument has sprung.
In the second class there are, in addition to the lifting motion, two horizontal movements at right angles to one another.