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A reproduction (replica) of Galileo's original telescope is placed in the Museum of Technology

The original lenses were donated to Technodea by Prof. Jacob Zik from the University of Haifa and the telescope itself was built, from the materials that were common in Galileo's day, by the telescope builder Eden Orion

Galileo's two telescopes from the Science Museum in Florence
Galileo's two telescopes from the Science Museum in Florence

The Science Museum in Florence displays two Telescopes attributed to Galileo. Now a restored telescope is placed from the same materials used to build telescopes in Galileo's time, and with lenses built by Alup, as an exact reproduction of the lenses used by Galileo, as measured from the original instruments found in Florence.

The director of Technode, Ilan Manolis says that the telescope, which works well, magnifies 21 times. The telescope has two lenses:
Central objective lens (objective) located at the front of the telescope and its technical data,

  • Focal length: 98 cm
  • Lens diameter: 3.7 cm
  • Thickness in the center of the lens: 2 mm

An eyepiece lens (ocular) is at the end of the telescope near the observer's eye and its technical data,

  • Focal length: 4.75 cm
  • Lens diameter: 2.2 cm
  • Thickness in the center of the lens: 1.8 mm

The lenses in the restoration were manufactured by the 'Al-Op' company according to a specification designed by Dr. Yaakov Zik from the University of Haifa. The lens specifications are based on an optical analysis of the telescopes on display at the Science Museum in Florence. The lenses in the reconstruction were made of glass similar in its optical properties to the lenses of Galileo's telescope, as were the tubes, which were built from materials as close as possible to those from which the original telescope was made.

Among the reconstructions of Galileo's telescopes made in the world, the telescope in front of you is the only one in which the optics are almost identical to the lenses of the original telescope. The restored telescope is fully usable and you can repeat the same observations and measurements that Galileo made 400 years ago in which he discovered the mountainous surface of the moon, the moons of the planet Jupiter, the appearances of the planet Venus, sunspots and the nature of the Milky Way.

The photo above shows the two original telescopes on display at the Science Museum in Florence. The 21x magnifying telescope, whose reconstruction is presented before you, is the lower of the two.
The lenses were donated to Technoda courtesy of Dr. Yaakov Zik. The telescope was built by telescope builder Eden Orion.

  • Al-Op produced six sets of the lenses. One set was broken during production, the second set remained in the company's archive, leaving four sets. Dr. Jacob Zik sent one set to a research partner in the Netherlands, built a simple telescope for himself and donated one of the remaining two sets to a technologist. This is the lens set that forms the basis of the telescope in front of you.
  • The lenses are so faithful to the original that not only are they made of the same type of glass that Galileo used, but they contain all the flaws found in the original lenses!
  • The tube is built from thin and light wooden strips glued to felt fabric. The fabric is rolled into a roll and wrapped in two types of natural leather - the same methods that Galileo used to build his telescope, which is the basis for the telescope in front of you.

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