Book 3 — Box to Protect Extra Spark Plugs

The Spark Plugs are Fitted Compactly in the Case and are Protected from Damage

Damage often results to spark plugs which are thrown in the tool box of an automobile, and the use of a small case for the extra spark plugs is desirable. Partitions may be fitted into an old box of suitable size, or a case may be specially made. That shown was designed to provide for six spark plugs in a minimum of space. It was made of ¹⁄₄-in. wood, and of a length so that the spark plugs could be slipped in the recesses only by turning the faces of adjoining plugs together. A hinged cover keeps them firmly in place.—E. R. Mason, Danville, Ill.