. American engineer and railroad journal . uring the transfer fromthe first graduate to the second, whether this transfer is madeafter the tar determination, or as a part of this determination,as described. There would be, therefore, 97 cubic centimetresof gasoline solution, which contains all the tar acids. But inthe case supposed we find that 80 cubic centimetres of thissolution contain 9 cubic centimetres of tar acids. Therefore97 cubic centimetres, or the whole of the gasoline solution,contains (80 : 97 :: 9 : 10 91) cubic centimetres of taracids, or this amount differently expressed
. American engineer and railroad journal . uring the transfer fromthe first graduate to the second, whether this transfer is madeafter the tar determination, or as a part of this determination,as described. There would be, therefore, 97 cubic centimetresof gasoline solution, which contains all the tar acids. But inthe case supposed we find that 80 cubic centimetres of thissolution contain 9 cubic centimetres of tar acids. Therefore97 cubic centimetres, or the whole of the gasoline solution,contains (80 : 97 :: 9 : 10 91) cubic centimetres of taracids, or this amount differently expressed is ( X 100 -=-20) per cent. This explanation may be briefly summa-rized as follows : Subtiact 23 from the reading obtained whendetermining tar acids, and call this remainder a. Deductfrom 100 cubic centimetres the number of cubic centimetresshowing the tar and one more. Call this remainder b. Thenmake a proportion 80 : b :: a : x. x shows the volume in cubiccentimetres of the tar acids, and from this calculate the oa a «i MO Eh09 ►JO o SI a aoa aw EhO W«w p <!O PS K Og 5«s HPSK*3 = E q pq Ph HS Eh PS o w p- w Q ap* ft o § ao 2 Eh PSOPm Eh < Eh 9 Ph H0-:MO Eh00 Jh! O u Vol. LXIX, No. (,.] AND RAILROAD JOURNAL. 257 NOTES AND PRECAUTIOUS. Tho material to which this method applies is a distillate ofGeorgia pine, known under various trade names, such as fer-nolino, spirittine, pine oil, etc. It is, of course, not applicahloto all wood preservatives, and those made from other kinds ofwood and from coal tar do not behave, when treated as themethod describes, like the Georgia pine distillate. If the 20 cubic centimetres of the distillate are poured intothe graduate and then the gasoline added, it is much moredillicult to get the gasoline and distillate thoroughly mixedthan if the manipulation described is followed. It will be observed that what is counted as tar is the mate-rial which separates from the distillate when treated withgasoline under th
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