erhaps twenty inches in diameter,
may be excited to the point of doing practical work without danger of
breaking the glass walls. But certain precautions are necessary. When
he uses tin-foil electrodes on the outside of the bulb, he protects
the tin-foil edges, and, what is more essential, uses extremely small
Leyden jars and a short spark gap between the poles of the discharging
rods. The philosophy of this is, that the smaller the jars, the
greater their number of oscillations per second (easily fifteen
million, according to Dr. Lodge's computations), the shorter the wave
length, and, therefore, the greater the intensity of effects.
[Illustration: A GROUP OF FAMILIAR ARTICLES UNDER THE ROeNTGEN RAYS.
From a photograph by Professor Arthur W. Wright of Yale College, taken
through an ebonite plate-holder with fifty-five minutes exposure. It
shows a pair of spectacles in their leather case; an awl and a saw,
with the iron stem, plainly visible through the wooden handles; a
magnifying-glass; and a combination wooden tool-handle with metallic
tools stored in the head, and the metallic clamp visible through the
lower half.]
The next step was to bring more energy into play, still using Leyden
jars; and for this purpose Dr. Morton placed within the circuit
between the jars a Tesla oscillating coil. He was thus able to use in
his shadow pictures the most powerful sparks the machine was capable
of producing (twelve inches), sending the Leyden-jar discharge through
the primary of the coil, and employing for the excitation of the
vacuum tube the "step up" current of the secondary coil with a
potential incalculably increased.
While Dr. Morton has in some of his experiments excited his Leyden
jars from an induction coil, he thinks the best promise lies in the
use of powerful Holtz machines; and he now uses no Leyden jars or
converters, thus greatly adding to the simplicity of operations.
In regard to the bulb, Dr. Morton has tested various kinds of vacuum
tubes, the ordinary Crookes tu
Notka biograficzna
Robert Laurence Bob Barr, Jr.[5] (born November 5, 1948) is the Libertarian Party nominee for President of the United States in the 2008 election.[6] He is a former federal prosecutor and a former member of the United States House of Representatives.[7] He represented Georgias 7th congressional district as a Republican from 1995 to 2003.[7][8]
Pozycja Wlochy Chiny Obuwie Slownik Eng EsperantNorman De Mattos Bentwich OBE MC (28 February 1883-8 April 1971) was a British barrister and legal academic who served as Legal Secretary and the first Attorney-General of Mandatory Palestine from 1918 to 1929. He was also President of the Jewish Historical Society. He was the eldest son of Herbert Bentwich.
Jack London (12 January 1876 22 November 1916)[1][2][3][4] was an American author who wrote The Call of the Wild and other books. A pioneer in the then-burgeoning world of commercial magazine fiction, he was one of the first Americans to make a lucrative career exclusively from writing.[5]