FOR PRACTICAL 

 WORKERS 



^ 



A New Life-Preserver Made of 

 Sheet Metal 



METAL swimming plates have made 

 their appearance in the field of life- 

 preservers. These are called the safety-first 

 buoyant swim- 

 ming -plates 

 and they con- 

 sist of metal 

 parts put to- 

 gether just like 

 two tin pie- 

 plates soldered 

 with their face? 

 joining, allow- 

 ing the space 

 between them 

 as a dead air 

 chamber. The 

 advantage of 

 these plates lies 

 in the fact that 

 they will not 

 rot or crumble 

 like a cork life- 

 preserver. A properly ap- 

 plied paint prevents rust- 

 ing, and they are always 

 ready for use. They do not 

 have to be inflated like the 

 water wings which are used 

 by some swimmers. There 

 is no danger of leaks or 

 punctures and the total 

 weight of the appliance is 

 about 3 lbs. The plates are 

 not uncomfortable to wear 

 and they allow a free arm 

 movement to the swimmer. 

 Three of the plates are joined 

 together with a web band 

 having a shoulder strap 

 which buckles about the 

 body under the arms, with 

 two plates on the back and one on the 

 chest. Small wire loops make the joinings. 



Adjusting the life-preserv- 

 ers made of metal plates 



Using Straight Side Tires on 

 Clincher Rims 



CAREFUL application of tires is as 

 necessary to good service as the selec- 

 tion of correct si^e for the load, or rims of the 



right design and 

 regular meas- 

 u r e m e n t . 

 Straight side 

 tires are some- 

 times used on 

 clincher rims, 

 but in such in- 

 stances filler 

 beads should be 

 fitted in the rim 

 clinches to pre- 

 vent the side 

 walls of the 

 tires from being 

 chafed and 

 gouged by 

 them. To avoid, 

 as much as pos- 

 sible, the ten- 

 dency of straight side tires 

 to lift up from the rims at the 

 inner edges of the cables and 

 thus permit a rolling action 

 sideways, it is considered 

 advisable to have more 

 spread between the cables 

 than is necessary with the 

 beads of the clincher type. 

 The use of straight side 

 cases on clincher rims is 

 therefore discouraged. If 

 best results are to be e.\- 

 jjected from straight side 

 tires they should be used 

 only on straight side rims 

 which are slightly wider at 

 the base, and which permit 

 of the necessary spread be- 

 tween cables. Consider these cautions, 

 and your tires will last longer. 



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