of the Telescope - Binocular
Phoenicians cooking on sand discovered
glass around 3500 BCE, but it took about 5,000 years more for glass to
be shaped into a lens for the first telescope. A spectacle maker probably
assembled the first telescope. Hans Lippershey (c1570-c1619) of Holland
is often credited with the invention, but he almost certainly was not the
first to make one. Lippershey was, however, the first to make the new device
telescope was introduced to astronomy in 1609 by the great Italian scientist
Galilei, who became the first man to see the craters of the moon,
and who went on to discover sunspots, the four large moons of Jupiter,
and the rings of Saturn. Galileo's telescope was similar to a pair of opera
glasses in that it used an arrangement of glass lenses to magnify objects.
This arrangement provided limited magnification--up to 30 times for Galileo--and
a narrow field of view; Galileo could see no more than a quarter of the
moon's face without repositioning his telescope.
In 1704, Sir
Issac Newton announced a new concept in telescope design whereby
instead of glass lenses, a curved mirror was used to gather in light and
reflect it back to a point of focus. This reflecting mirror acts like a
light-collecting bucket: the bigger the bucket, the more light it can collect.
The reflector telescope that Newton designed opened the door to magnifying
objects millions of times--far beyond what could ever be obtained with
Newton's fundamental principle of
using a single curved mirror to gather in light remained the same. The
major change that took place was the growth in the size of the reflecting
mirror, from the 6-inch mirror used by Newton to the 6-meter (236 inches
in diameter) mirror of the Special Astrophysical Observatory in Russia,
which opened in 1974.
The idea of a segmented mirror dated
back to the 19th century, but experiments with it had been few and small,
and many astronomers doubted its viability. It remained for the Keck
Telescope to push the technology forward and bring into reality this
A binocular is a optical instrument
for providing a magnified view of distant objects, consisting of two similar
telescopes, one for each eye, mounted on a single frame. The first binocular
telescope was invented by J. P. Lemiere in 1825.
Early History of the Binocular
The modern prism binocular began
with Ignatio Porro's 1854 Italian patent for a prism erecting system.
First 300 Years of Binocular Telescopes
"What we call a binocular is a binocular
telescope, two small prismatic telescopes joined together. When Hans Lippershey
applied for a patent on his instrument in 1608, the bureaucracy in charge,
who had never before seen a telescope, asked him to build a binocular version
of it, with quartz optics, which he is reported to have completed in December
Telescopes and their Makers
"Box-shaped binocular terrestrial
telescopes were produced in the second half of the 17th century and the
first half of the 18th century by Cherubin d’Orleans, by Pattroni in Milan,
and by I.M. Dobler in Berlin; but were not successful because of their
clumsy handling and poor quality."
Telescope Facts - James Short
The Short Telescope, was made by
the Scottish Instrument maker James
Short in 1740. An optician and astronomer, James Short invented the
first perfect parabolic and elliptic, distortionless mirror ideal for reflecting
telescopes. James Short built over 1,360 telescopes.
Short - Biography
& Reading Glasses
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