wo poles; for while the ordinary electric spark would not
traverse the rubber, any cathode rays that might be present would do
so with great ease, the circular window in the glass plate allowing
them passage there.
[Illustration: DR. WILLIAM J. MORTON PHOTOGRAPHING HIS OWN HAND UNDER
ROeNTGEN RAYS.
In this case the vacuum bulb is charged from Leyden jars which, in
their turn, are excited by an induction coil.]
The current being turned on, it was found that the powerful electric
sparks visible to the eye, unable to follow a straight course on
account of the intervening rubber plate, jumped around the two plates
in jagged, lightning-like lines, and thus reached the other pole of
the machine. But it was noticed that at the same time a faint spray of
purplish light was streaming straight through the rubber between the
two holes, as if its passage was not interfered with by the rubber
plate. It was in company with this stream of violet rays, known as the
brush discharge, that the doctor conceived the invisible Roentgen
rays to be projected at each spark discharge around the plate; and
presently, when the photographic plate was developed, it was found
that his conception was based on fact. For there, dim in outline, but
unmistakable, were shadow pictures of the ten letters which stand as
historic, since they were probably the first shadow pictures in the
world taken without any bulb or vacuum tube whatever. These shadow
pictures Dr. Morton carefully distinguished from the ordinary
blackening effects on the film produced by electrified objects.
Pursuing his experiments with static electricity, Dr. Morton soon
found that better results could be obtained by the use of Leyden jars
influenced by the Holtz machine, and discharging into a vacuum bulb,
as shown in the illustration on this page. This arrangement of the
apparatus has the advantage of making it much easier to regulate the
electric supply and to modify its intensity, and Dr. Morton finds that
in this way large vacuum tubes, p
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]
Książki Increase dla każdego Jozef Oleszkiewicz Jerzy Faczynski Stefan Filipkiewicz SledzinskiNorman 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]