Whether the logs arrive by water or by rail, they are, if possible, stored in a mill-pond until used in order to prevent checking, discoloration, decay, and worm attack.

From the pond they are hauled up out of the water on to a "jack-ladder," by means of an endless chain, provided with saddles or spurs which engage the logs and draw them up into the second story on to the log slip, Fig.

36.
[Illustration: Fig.37.

Two-Story Mill at Virginia, Minnesota, Showing Jack-Ladders and Consumer.] [Illustration: Fig.38.

Log-Flipper.] [Illustration: Fig.39.