. . "Figure 1 is a vertical central section through the lower portion of a well having a plunger mechanism constructed according to our invention; Fig. 2 is a view simllar to Fig. 1, but showing details of the mechanism shown in Fig. 1 upon an enlarged scale; Fig. 3 is a cross section on the line 3-3 of Fig. 1; Fig. 4 is a side elevation showing, in detail, a portion of the lower end of the cable which" . .