FRASCIS AND GRAYSOS-SOXE FUNDAMENTAL PROPERTIES OF h Y S 0 T K . E ASIIP~TOS
wns found possible to persuade n lrirge trnnsport orgnnisntion to use n creosote blend. When the first bntch of the specially refined creosote wns received by them they tried n mixture of two pnrts of normal fuel to one of creosote. It wns found thnt this resulted in difficult starting and excessive smoke, pnrtieulnrly in cold wenther. Sump dilution wns nlvo found to hnre incrensed considerably. In view of tlie different types of engines employed, nnd of the necessity of mnintnining the utmost relinbility in the bus service, the trnnsport orgnnisntion did not endenrour to work out the highest concentrntion of creosote thnt would be worknble, but nfter trinls, they fixed on n blend of six pnrts of normnl Diesel oil to one of creosote ns being n blend likely to give them trouble-free running beyond nny doubt. This policy ennbled theni to put their wl~olc fleet on this blend, and accordingly lnrge quantities of creosote nere consumed nnd the matter wns tested on nn exceptionally large scnle.
The first large-scnle deliveries begnn enrly in IInrch, 1940, and the creosote wns nbsorbed nt the rate of upproximutely 12,000 gnllons per month.
At the time of writing this pnper, the transport fleet has been running for twelve months on this blend, and over one million gnllons have been used. Genernl running hns been sntisfnctory. Stnrting did not give rise to any difficulty, nnd there hns been no trouble with smoke. Cmnk-case dilution of the lubricnting oil has been ascertained to be fnirly normal. Regarding nozzles nnd cylinder wenr, nn absolute compnrivon could only be made at the expirntion of n much longer period, but up to the present the condition of the nozzles nnd cylinder wenr nppenr to be rensonnbly normnl. Regnrding consumption, computed in miles per gnllon, the creosote blend figure seems to be slightly lower thnn standard Diesel oil, but the number of vnrinbles-engine, route, wenther, etc.-mnke this difficult to verify. This result cnn be considered ns very sntisfnctory, especially in view of the large quantities of creosote used, the length of time involved, the cycle of wenther conditions, end the different engines used.