VENTILATED CUSHIONS. 261 



cushions will form an excellent life-buoy, for which reason they 

 should not be so firmly attached to the boat as to prevent their 

 being used in case of accident. 



VENTILATED BOAT CUSHIONS. 



These are manufactured of quilted fabrics, perforated between 

 the compartments or cells, as represented, plate xxvii., fig. 6. 



This style of work is particularly adapted to boats, for the 

 reason that the water is immediately drained off from them. 



SELF-INFLATING CUSHIONS. 



Self-inflating cushions may be best made of plated fabrics, 

 and may be recommended chiefly on account of their compact- 

 ness when collapsed, and of the ease with which they are filled like 

 other self-inflating articles. When they are made with the self- 

 acting valve tube for each compartment, in case they become 

 damaged so as not to retain air, they may be stuffed through 

 the tubes with any suitable material, such as ground cork, 

 chopped gum, elastic sponge, curled hair, or moss, in which case 

 they will answer all the purposes of a stuffed leather cushion. 

 See plate xxvii., fig, 7. 



VENTILATED CUSHION. 



These are made of the quilted fabrics, to be inflated with 

 one tube, as represented by fig. 8, plate xxvii., or with a tube for 

 each separate row of cells, as represented by fig. 9. Cushions 

 of this pattern are not liable to the common objections to air 

 cushions, that of being uncomfortably warm, and rolling about. 



