We conclude that, with a grating composed of transparent and opaque parts, the utmost light obtainable in any one spectrum is in the first, and there amounts to I/**wr** 2, or about 6, and that for this purpose W a and d must be equal.

(I) Hence **WR** measures the torque T.

Water of the Great Bend (par **wr**) of Naharin (N-h-r-n)" (Breasted„ Anc. Rec. ii.

The precise meaning of pier **wr** is not certain.

His chief work was a treatise on nature (Hew: 4 iio **wr**), in thirty-seven books, of which fragments from about nine books have been found in the rolls discovered at Herculaneum, along with considerable treatises by several of his followers, and most notably Philodemus.

Then the biquaternion n q + **wr** suffices.

Of the point x is **wr**, and the velocity of the point y is ws.

In drawing these polygons the magnitude of the vector of the type **Wr** is the product **Wr**, and the direction of the vector is from the shaft outwards towards the weight W, parallel to the radius r.

The conditions (c) may thus be expressed: first, that the sum of the vectors **Wr** must form a closed polygon, and, second, that the sum of the vectors War must form a closed polygon.

Then, transferring the product **Wr** correspondinf with this balance weight to the reference plane, proceed to draw the force polygon.

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