We have been guided in the selection of the particular quadrilateral adopted by the rule of arranging the order of the sides so that the same letters indicate corresponding sides in the diagram of the frame and its reciprocal.

Cap. 5) we find the correlated problem of the image of the sun passing through a quadrilateral aperture always appearing round, and he further notes the lunated image of the eclipsed sun projected in the same way through the interstices of foliage or lattice-work.

Yds., form an irregular quadrilateral built round a court-yard and flanked by four huge towers.

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The balance is adjusted by shunting either AD or BD with a box, S, containing 20 to Ioo ohms. All the wires in the quadrilateral must be of the same metal as AB, to avoid accidental thermoelectric effects which would obscure the result.

The island is a quadrilateral with hollowed sides, about 12 m.

They fortified it strongly in 1814, and with Peschiera, Mantua and Legnago it formed part of the famous quadrilateral which until 1866 was the chief support of their rule in Italy.

At the latters death in 1830 Ferdinand now flew to arms, and the Austrian garrisons, except in the Quadrilateral (Verona, Peschiera, Mantua and Legnano) were expelled.

And Gratian as a quadrilateral hall with four huge granite columns (now removed) in the centre, it was converted into a church about the close of the 4th century, and restored by Bishop Nicetius about 550.