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This paper discusses individually and collectively the several factors which will affect future fuel trends in the farm tractor field. These factors are (1) past and present fuel consumption trends, (2) fuel manufacturing trends, (3) engine design and production trends, (4) economic trends. On the basis of this analysis it is concluded that the predominating farm tractor fuel of the immediate future will be regular grade gasoline, followed by LP-gas and diesel fuel. Future consumption of kerosine-type distillate will be insignificant. Gasoline tractors will continue to increase in compression ratio in order to take full advantage of the high octane number level of present gasoline. Gasoline tractors designed to burn premium grade fuel represent a trend in the more distant future.

The concept of impedance of mechanical elements is presented by the analogy to electric circuits. The impedance concept makes the whole field of circuit analysis with its highly developed circuit rules, theorems, and mathematics available for the solution of mechanical problems. Because the calculation of the impedance of most structures is very difficult, a direct measurement of impedance can simplify the problem. Several devices for this measurement are presented. Then, a computer and recorder is shown which calculates and plots impedance information as the measurement is being made. Finally, examples are presented where velocities at points on a simple structure are predicted for sinusoidal excitation and the shock-excited velocity response of a mass mounted on sponge rubber is predicted from impedance information.