Troughs for hogs are built in two styles—wedge-shaped, like the feed
trough shown on page 49, or like troughs for cattle except smaller.
Use short lengths of 1-inch pipe crosswise to keep the hogs out of the
trough. Set bolts, properly spaced, in the soft concrete sides, so that
the pipes will fit between them and can be held firm by a strap iron
over the bolts.
[Illustration]