264 GOODYEAR ON GUM-ELASTIC. 



Where the cells, in all about six hundred, are stuffed with 

 curled hair, each being separated from the other, two-thirds of 

 these may be rent or damaged before the bed will become un- 

 safe as a life-preserver. See plate , fig. . 



VENTILATED BEDS. 



These are also made either of the air- work or quilted fabrics, 

 and perforated, as represented in plate , fig. . Their chief 

 recommendation is that they are not like other gum-elastic beds, 

 uncomfortably warm in hot weather, and when the rows of cells 

 are inflated by separate tubes, and especially when stuffed with 

 curled hair, they are more secure from being damaged than any 

 other gum-elastic bed. 



SELF-INFLATING BEDS. 



These are manufactured like other articles of self-inflating air- 

 work, and are inflated either with one tube, or with separate 

 tubes for each cell or compartment. 



On account of the ease with which they are filled, and the 

 certainty of their retaining the air when the cells are inflated 

 separately, they are superior to other air beds for persons who 

 are travelling, when they are not certain of finding beds, or are 

 not satisfied with the quality of those they do find. 



HOSPITAL AIR BED. 



See Chapter 



