Show I I now TO ASCERTAIN ASCERTAIN AUTOS AUTO'S HORSEPOWER I There is only one method of exactly 1 i measuring horse bone po power cr in a gasoline automobile automobile au au- I en engine ne that is by actual test with a mechanical machine such as aro are I built huilt to show strain It makes no rIi difference dif f. f ference what formula may mav be used for calculating tho the power Vcr of the engine i trilling trifling inaccuracies are aro found to result But it is possible to calculate quickly quick quick- I ly iy by br some means the horse horst po power er of ev every ever rv automobile engine to within a reasonable reasonable rea rca I degree detree of accuracy and this is all 11 that any purchaser or owner of these j machines has any practical us use for There are arc several eral formula used by dealers but bit the best and quickest is th the I French method which calculates upon I the bore of the tho cylinders the stroke of i the pistons piston the number of revolutions re I made b by the thc e engine ine per minute at any anyone ono one time I This formula is ii here hero given ghen for the use me 1 of automobile owners whose ideas of If the thereal rea real power rower of their machines is based I frequently only on advertising statements statements state tatA ments or else Ifo careless statements of dealers and chauffeurs This is the formula for for- mula muia Take the square of the bore and multiply mul by the tIre number of cylinders Then TheD multiply this last lat figure by hr the number of revolutions made by the tho engine per minute J Divided i this answer b by ten raised to the ninth power an and m multiply this result by In four The fi figure ure now obtained is is horse e power potter of your our ma ma- chine liine As the measurement of both tho stroke and bore is usually given iven in inI millimeters the complications complication that result result re re- re- re sult suit are aro slightly cumbersome but bot if an I inch loch is s taken to be bo equal to 23 25 5 millimeters tho the results will be accurate enough for lor any ordinary work Al Also o in the average a car the number of revolutions per minute is 1500 and the average owner o who ho works out this thi problem lem cm can bo bp sure lure that he be has found found- the amount of his horse power fa fn more than he bo can obtain it from fromi II i dealer or agent j Tou t tl once cw i. i n t f l d nt team at J Ind |