Show t S Practical Instruction g in Motor n A. A R R- ROCHE S Tt O l er U U. U S. S Instructor ml nI In Inspector r S S C Construction or f jj Ll rt sh t K Ks s South uth Temple The lie Herald raId ilent cn and Cooling t tJ J If some portion of or the cylinder cUnder beco be- be co comoa moo red hot or oven even approaches that heat boat the heat hent of oC this portion together with the tho heat of compression will be sufficient to Ignite the gas In other words wor-ds this will cause pre There arc are at present two methods used for tor cooling of gas sas engines One Is Is air the other water To lo bog begin with let us remember that thata a square Inch o of metal will radiate or give c 0 off a t certain ln amount of or heat In a aglon given on time Tho moro more square e Inches of or surface we have ha on the outside o of ofa ofa a a. motor cylinder clInder the moro more heat hent can be he radiated d or given off In a given Iven time Vo Wo are c all familiar with the motorcycle engine eng It Is constructed with a great many fins or ridges around the cylinder the purpose of which Is IR to present as man many square Inches of oC the surface to the tho air as pos pos- sible Remember the moro more air that passes I a square sQuar-e inch of ot metal in itt a given I en time tho the moro more heat the tho metal will be able I to give S1 off or ol radiate Therefore e we weI I find large cooled air-cooled motors arran arranged ed edwith with a blower of or some some description which will cau cause c a great g amount of or air aJr to flow low through tho the f flanges on the cylinders and arid frequently there are Jackets jackets Jack jack- ets eta or housings along t to cause causa tho the air to flow through ough these flanges This only applies to stationary stationary station station- ary tr motors In tho the case CulO of or r rotary motors motors mo mo- tors lors these will vill be taken up later Inter The Tho other method of cooling engine cylinders Is to construct them with a double wall wail filling the space between the walls alls with water v. then as ns tho the wa- wa er cr Is s heated b by the thc explosion Inside tho ClIn cylinder or we must have ha means of or removing the tho hot water and replacing it with cool water For a stationary motor wo we e generally U use one or two largo large tanks to draw from and as the water is cooled It Is pumped back into the thc tank but on an automobile we all know now It Is s necessary to carr carry a n. small amount of water and for the sake of or light weight ther we must t have a means of oC properly cooling the w water ter Example We all an know knot how to cool coola a a. plate or dish of or hot food Wo We 0 spread it out thin an and In this way n expose many square Inches of it to the air If H we could carr carry a tank so arranged that thal the water can be bo spread out over overa a hundred square feet and not more than sixteenth one of an inch deep this would make maleo an ideal radiator as asfar asfar asfar far as is concerned But Dut It would be too lar- lar large lare e for any I nr practical purpose and wo we would lo lose c too much water b by evaporation therefore c we use tise J s of many t types pes These r dla- dla arc are constructed so that thal the they c spread tho the vater In Yen very thin la layers er 5 usually tho tIm thickness of oC hea heavy paper about one- one fourth sixty th to second one of an Inch The Tho water is In thin sheets of or copper which Is a no tr very good conductor of or heat Water heats the copper and the copper Is cooled b by air In a good designed radiator we expose man many square feet of oC surface to the cool air In this wa way comparatively el speaking speak speak- lug ing small radiators s lator-s ca cool a lar large e amount of water within a short time lime In automobiles tho the ra radiator ator Is driven through the air at a speed of from eight to nt fifty miles per hour thus insuring an ample supply of or cool air |