double astrograph造句

In 1906-a tower with dome for Zeiss double astrograph.
The principal telescope of EACUC is a double astrograph consisting of two lenses each 20-inches ( 50.8 cm ) in diameter, one designed for blue light and the other for yellow light.
A pioneer in astrophysics, his large, wide-field " 20-inch Carnegie double astrograph " built for the observatory's proper motion survey ( lunar craters " Wright ".
There are four large optical telescopes, each in its own cupola or dome : an 1-m Askania Schmidt camera ( one of the largest telescopes of this type in the world ), a 65-cm reflector and a 50-cm Askania double astrograph.
It's difficult to find double astrograph in a sentence. 用double astrograph造句挺难的