Elements of the **graph** are shown from an axis through 0 and at right angles to OX.

The **graph** will then be made up of a succession of parallel lines.

The assemblage of ordinates NP is then the **graph** of Y.

If, for instance, the **graph** were a trapezium, the calculation of the area would be equivalent to finding the integral, from x=a to x=b, of an expression of the form px+q.

If we assume that the bolograph of solar energy is simply a **graph** of amorphous radiation from an ideal radiator, so that the con- Temperature stants cl, c 2, of Planck's formula determined terrestrially apply to it, the hyperbola of maximum intensity is XO = 2, 921 X 10 7; and as the sun's maximum intensity occurs for about X =4900, we find the absolute temperature to be 5960° abs.

There are also cases in which **graphics** and mensuration are used jointly; a variable numerical quantity is represented by a **graph**, and the principles of mensuration are then applied to determine related numerical quantities.

When the series is theoretically continuous, the theoretical **graph** will be a continuous figure of which the lines actually drawn are ordinates.

The question of constructing a telegraph in Persia as a link in the overland line to connect England with India was broached in Teheran by Colonel Patrick Stewart and Captain Anglo- Champain, officers of engineers, in 1862, and an agreeIndian Tele~ment on the subject concluded by Edward Eastwick, **graph** Line.

The latter relation shows that the bending moment varies as the area cut off by the ordinate in the **graph** of F.

The **graph** of F is a straight line; that of M is a parabola with vertical axis.