Book 3 — Removing Sag from Couch Spring
Reading edition
A couch spring of the type shown in the sketch sagged considerably, making it ineffective. The sag was taken up by bending the sections of wire with a monkey wrench, so that the entire spring was stiffened almost as satisfactorily as when new. Care must be taken that the wires are bent uniformly so that the strain is evenly distributed.
¶An eggshell may be balanced on the edge of a knife if the egg is “blown,” and then partly filled with sand.