Norwich bulletin., 1915-01-28


 51a inch tire .-............11o pounds
 They are trying 10 educate the user to see that his tires are kept inflated. to this pressure by taking readings with d tire pressure guage, of which there are several reliable makes on the market at O. moderate price. Ad- Justments are being made on this basis. As in years gone by, many tire. users do not have a. pressure guage- but judge the proper imitation by kick, ing the tire to see whether it is hard. enough. In most eases where this crude method is used and a. tire gauge iS afterwards applied it is found that under-inffated- There is. however. q great reduction in the number of com plaints along this line today. 2
 Practically all the tire manufacture CTS use a yearly uniform table, giving the weight of the different sized tires 6atIon pressure. If tires were used lIL accordance with this table, rhe proa and cons of tire inda&ioB would be re- duced to @ minimum, and the owners of cars would not be CompIsi iuins about short milage- ,.
 The heat genera ted within Q tfI'e na much to do with the air pressure usecl the faster the speed the greater the heat. The greater the heat the great CT the strain on account of the expan = sion of air within the tire Continu Ous driving generates excessive heat as well as driving in hot weather. Eix- CcSsIve heat is injurious to the shoe and causes rapid deterioration f there is not sufficient volume of com pressed air within the tire, due Jes using an improper size. to absorb ali of the shock and vigration, the sur plus shock and vibration is transmit ted 10 the car. The greater the voIz une Of air In q tire, the less the in crease of heat and strain when driving under climatic conditions which pro duce excessive heat. as well as when driving at great speed or doing heavy work.
 A tire should be sufficiently large not to fiatten at the point of road con tact more than 14 per Ceat. of it's sec uon7I diameter or on an average lI per cent, to give good service.
 A tire of sufficient volume fo prop erly carr load with proper tire pressure wiIl, if not proper ly inflated. deterIorate much more rapidly from excessive feXing. causing the fabric to break down quickly. and is much more liable to DUncture- Still the useE= closes his eyes to these facts, when he considers only the personal com fort of. the occupants of the car, f0Ga he well knows that an under-inf1ateG- tire will give greater riding comfort as it ahsoTbs the vibration and shocks more quickly and thoroughly. After he has driven his tire under-infiated- and received a much less than normal mileage from it he is brought face tQ face with the increase in tire expense. which he las brought upon himself.
 The personal equation of the driver has to be considered: the tendency not to see that the tires are properly in Hated. the manner in which he drives TFe service of the car, whether for light or heavy work, the climate and seasons. the geographical location. the type of road bed, the use of shock ab- Sorbers, the spring equipment and the distribution of the load of the car. are also factors. Some motor car manu- facturers are inclined to equip their ciently large to perform the required making them so rigid as to cause the cars to ride as though equipped with solid tires. This is a rt-sighted practice, for the reason that if the user keeps his tires inflated excessive ly. he shortens the life of his car and increases his car repair bill, and the car maker does not retain the good will of his customer. as he would bE putting on tires of sufficient cubicaI content. This condition caused the manufacturers to design what Is com mouly known as the oversize tire which was first purchased by the car user after he found out that his car was undcr-tired, and has since been adopted by many motor car manu- factuTeTE-
 The following taJu!axfon shows the weights co 5,s cae-:ett on tires, the cars to De 7Tsienet; wltlitgI& passengers or baggage.