Rontgen

4035

Rood

also by Page in his Songs and Sonnets of
Pierre de Ronsard (1903).

Rontgen, Wilhelm Konrad von (1845-
1923), German physicist was born at Lennep.
It was while he was professor of physics at
Wiirtzburg that he made the discovery for
which his name is chiefly known, the Ront-
gen rays, popularly known as X-rays, a

eel screen, hence termed the rood screen.
Generally figures of the Virgin and St. John
were placed on each side.

Rood, a unit of superficial measurement,
the fourth part of a statute acre, and equal
to 40 square perches or poles, or 1,210 square
yards.

Rood, Ogden Nicholas (1831-1902), Am-

Types of Roofs.

name he used owing to doubt of the exact
nature of these curiously acting rays.

Rontgen Rays, X-rays. See Vacuum
Tubes, Radio-Activity and Radium.

Rood, a cross or crucifix; specifically a
representation of the crucified Saviour, or
more commonly, of the Trinity, placed in Ro-
man Catholic churches on or over the chan-

erican physicist. In 1858-63 he was professor
of chemistry and physics in Troy University,
N. Y., and in 1863-1902 professor of physics
in Columbia University, N. Y. He made
many valuable scientific discoveries, includ-
ing methods of making of quantitative ex-
periments on color-contrast, the measurement
of the duration of lightning flashes, and the