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Among the first requisites and of the utmost importance to successful trapping is the possession of an outfit of well made Steel Traps.

That the young trappers may understand what are the requisites of a good trap we will describe in detail one that has held its own in the estimation of the professional trappers for sixty years, and then we will endeavor to point out wherein the many so-called "improvements," that have been put on the market, have uniformly failed of success.

What the main spring is to a watch, a trap spring is to a trap, and unless the spring is made of a properly compounded steel and is of the right form and proportion and correctly tempered it will surely fail and make the whole trap worse than useless.

Certain mixtures of pig iron are used in making spring steel and if these mixtures are varied from in any particular or if the steel has a surplus of carbon, or is deficient in that element, it will not take a proper temper and consequently is of no value. A proper manipulation in the rolling mill is also necessary, or the steel may be entirely ruined in rolling.

A good spring when set should show a nearly uniform curve throughout. This indicates that it is properly tapered so as to bring a uniform strain on the steel. The lasting qualities of a spring are greatly dependent on the correctness of this point.