186 GOODYEAR ON GUM-ELASTIC. 



CHEST EXPANDERS. 



This is a strap of shirred goods, or elastic compound, used for 

 exercising the arms and chest, with a handle attached to each 

 end. See plate xv., fig. 3. 



BABY JUMPERS, 



Or what are sometimes called the infant's gymnasium, will be 

 understood by the diagrams in the plate, so that they may be 

 constructed in a cheap way by those who cannot afford to pur- 

 chase a completely manufactured article. 



Fig. 4 is the cheapest and really most convenient arrange- 

 ment, consisting of a straight bar of wood or bamboo, or a tin 

 tube, which should be cushioned and covered ; this is a substitute 

 for the hoops that are used in fig. 2. The springs of elastic 

 cordage or stayed compound used for this purpose, are about 

 eighteen inches long, one inch wide, and one-quarter of an inch 

 in thickness. Figs. 5 and 6 represents two kinds of harness or 

 dress, into which the child is placed, before it is suspended by 

 the straps to the hoops or bars. 



In fig. 4 the straps are united, and hung over the bars at the 

 ends, by which the child is so balanced that there is not the 

 slightest danger of its getting loose ; a small notch or bead being 

 formed at the ends of the bar to prevent the strap slipping off. 

 In figs. 7 and 8, the straps are buttoned to hoops. A basket of 

 light willow, fig. 9, is commonly first used for the infant, which 

 answers a much better purpose than the rocking cradle, giving 

 the tossing motion with which children are so well pleased. At 

 the age of about five months, the infant is old enough to be put 

 into the jumper, with which they almost uniformly continue to 

 be delighted from the first time they are placed in it, until they 

 can walk, when they prefer a wider range. Should they, as 

 sometimes happens, acquire a habit of whirling around, a string 



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