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Gimnasio Oxford school

The telescope

Philip Santiago Bernal Borja

Methodology

Diana lucia rojas

30/Agosto/2010

OBJECTIVES:

*Disclosure the telescope history , invention , who discovered the telescope , uses , the reasons was created , and the influence in the actual world.
*I want to know all about the telescope , because I want to see more than the stars , (space , theplanets , the moons)

Introduction:

In this work and presentation is presented the history and invention of the telescope , persons who was famous through the invention of the telescope and the reason the telescope was so important in history and our live.

The history of the telescope:

The earliest known working telescopes appeared in 1608 and are credited to Hans Lippershey. Among manyothers who claimed to have made the discovery were Zacharias Janssen, spectacle-maker in Middelburg, and Jacob Metius of Alkmaar. The design of these early refracting telescopes consisted of a convex objective lens and a concave eyepiece. Galileo used this design the following year. In 1611, Johannes Kepler described how a telescope could be made with a convex objective and eyepiece lens and by 1655astronomers such as Christiaan Huygens were building powerful but extremely large and unwieldy Keplerian telescopes with compound eyepieces. Hans Lippershey is the earliest person documented to have applied for a patent for the device.
Isaac Newton is credited with building the first "practical" reflector in 1668[2] with a design that incorporated a small flat diagonal mirror to reflect thelight to an eyepiece mounted on the side of the telescope. Laurent Cassegrain in 1672 described the design of a reflector with a small convex secondary mirror to reflect light through a central hole in the main mirror.
The achromatic lens, which greatly reduced color aberrations in objective lenses and allowed for shorter and more functional telescopes, first appeared in a 1733 telescope made byChester Moore Hall, who did not publicize it. John Dollond independently developed achromatic lenses and produced telescopes using them in commercial quantities, starting in 1758.
* (Michelson, A. A. & Pease, F. G. 1921 Astrophys. J. 53, 249)

The invention of the telescope:
The original Dutch telescopes were composed of a convex and a concave lens- telescopes that are constructed this waydo not invert the image. Lippershey's original design had only 3x magnification. Telescopes seem to have been made in the Netherlands in considerable numbers soon after the date of their invention, and rapidly found their way all over Europe.[citation needed]
19th century painting depicting Galileo Galilei displaying his telescope to Leonardo Donato in 1609.
Galileo happened to be in Venice inJune 1609[15] and there heard of the "Dutch perspective glass" by means of which distant objects appeared nearer and larger. Galileo states that he solved the problem of the construction of a telescope the first night after his return to Padua from Venice and made his first telescope the next day by fitting a convex lens in one extremity of a leaden tube and a concave lens in the other one. A fewdays afterwards, having succeeded in making a better telescope than the first, he took it to Venice where he communicated the details of his invention to the public and presented the instrument itself to the doge Leonardo Donato, who was sitting in full council. The senate in return settled him for life in his lectureship at Padua and doubled his salary. Galileo may thus claim to have invented thetelescope independently, but not until he had heard that others had done so.
Galileo devoted his time to improving and perfecting the telescope and soon succeeded in producing telescopes of greatly increased power. His first telescope magnified three diameters, but he soon made instruments which magnified eight diameters and finally, one that magnified thirty-three diameters. With this last...
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