The Saybolt viscosity of blends. . -thene and paraffin crudes, as the difference between them is not sogreat as to make the error in interpolating between them of seri- Saybolt Viscosity of Blends 19 cms amount. Density may be eliminated by using poises insteadof Saybolt viscosities. Then the only remaining variables are theviscosities of the two component oils, for which the correctionfactor for a 50 per cent blend is desired. A blend of any proportions may be considered as a 50 per centblend of two other blends. Thus a blend containing 20 per centof the lighter oil may be considered as a 50
The Saybolt viscosity of blends. . -thene and paraffin crudes, as the difference between them is not sogreat as to make the error in interpolating between them of seri- Saybolt Viscosity of Blends 19 cms amount. Density may be eliminated by using poises insteadof Saybolt viscosities. Then the only remaining variables are theviscosities of the two component oils, for which the correctionfactor for a 50 per cent blend is desired. A blend of any proportions may be considered as a 50 per centblend of two other blends. Thus a blend containing 20 per centof the lighter oil may be considered as a 50 per cent blend of twoothers, one containing 10 and the other 30 per cent of the lighterof the original components. In this case it would be necessary toreestimate the viscosity of the 20 per cent blend by equation (3)from the experimentally determined viscosities of the 10 and 30per cent blends. The tests of Series 2,3, and 4 were used in thismanner to estimate viscosities of 50 per cent blends, and theresults are shown in Fig. ,./ ,z .3 a s .6 .7 -8 .9 ao /./ /.a a /A Viscosity of Heavy OH, poises. Fig. 5.—Diagram for estimating the correction factor for viscosities calculated by the log-arithmic rule The figure is divided into two sections by the diagonal linemarked , the upper portion being for the blends P + M and thelower for the blends N-f-O. In plotting the diagram each point was marked with the corresponding value of ~ (not shown) and the lines drawn to conform as well as possible with these values,as in making a contour map. As might be expected from Fig. 4, 20 Technologic Papers of the Bureau of Standards the points for the upper portion of the diagram were more dis-cordant than those for the lower. No use was made of Series i,because the tests were less concordant and the range of viscositieswas not large. From the tests of Series 2 and 4 the errors in the logarithmicrule for estimating the viscosity of blends might at first sightappear so large as to rende
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