bes, the Geissler tubes, and has
obtained excellent results from the use of a special vacuum lamp
adapted by himself to the purpose. One of his ingenious expedients
was to turn to use an ordinary radiometer of large bulb, and, having
fitted this with tin-foil electrodes, he found that he was able to
get strongly marked shadow pictures. This application of the Roentgen
principle will commend itself to many students who, being unable to
provide themselves with the rare and expensive Crookes tubes, may
buy a radiometer which will serve their purpose excellently in any
laboratory supply store, the cost being only a few dollars, while the
application of the tin foil electrodes is perfectly simple.
In the-well equipped Jackson laboratory at Trinity College, Hartford,
I found Dr. W.L. Robb, the professor of physics, surrounded by
enthusiastic students, who were assisting him in some experiments with
the new rays. Dr. Robb is the better qualified for this work from
the fact that he pursued his electrical studies at the Wuerzburg
University, in the very laboratory where Professor Roentgen made his
great discovery. The picture reproduced herewith, showing a human foot
inside the shoe, was taken by Dr. Robb. The Crookes tubes used in this
and in most of Dr. Robb's experiments are considerably larger than any
I have seen elsewhere, being pear-shaped, about eight inches long, and
four inches wide at the widest part. It is, perhaps, to the excellence
of this tube that Dr. Robb owes part of his success. At any rate, in
the foot picture the bones are outlined through shoe and stocking,
while every nail in the sole of the shoe shows plainly, although the
rays came from above, striking the top of the foot first, the sole
resting upon the plate-holder. In other of Dr. Robb's pictures equally
fine results were obtained; notably in one of a fish, reproduced
herewith, and showing the bony structure of the body; one of a razor,
where the lighter shadow proves that the hollow ground portion is
almost as t
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]
Piękne plakaty - wiele motywów! Telefony Wedkarstwo Antoni Bak 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]