Air telescope

Tube-free telescope by Christiaan and Constantijn Huygens

An air telescope or aerial telescope is a telescope in which the objective and the eyepiece are not connected by a tube (tube). This type of telescope was invented in 1675 by the brothers Christiaan and Constantijn Huygens and published by Christiaan in his work Astroscopia Compendiaria in 1684 .

They attached the objective lens to a mast in a very short tube. The eyepiece was also mounted in a short tube piece. They connected these two tube pieces with a taut string so that the correct distance did not have to be readjusted for each observation.

Individual evidence

↑ JSchmoll: Telescope without tube. In: Astrotreff forum. July 24, 2012. Retrieved March 24, 2017 .
↑ Christian Huygens: Christiani Hugenii ... Astroscopia compendiaria, tubi optici molimine liberata (in Latin). Leers, 1684, section 7, page 8 ( limited preview in Google Book search). alternatively : citation of source in file: Aerialtelescope.jpg

Web links

Commons : Air Telescopes - Collection of Images

[1] JSchmoll: Telescope without tube. In: Astrotreff forum. July 24, 2012. Retrieved March 24, 2017 .

[books-MhSeQwAACAAJ--2] Christian Huygens: Christiani Hugenii ... Astroscopia compendiaria, tubi optici molimine liberata (in Latin). Leers, 1684, section 7, page 8 ( limited preview in Google Book search). alternatively : citation of source in file: Aerialtelescope.jpg