title: Extreme ultraviolet spectrograph ATM experiment S082B.
abstract: The extreme ultraviolet, double-dispersion, photographic spectrograph, Apollo Telescope Mount (ATM) Experiment S082B on Skylab is described. Novel features were the use of a predisperser grating with a ruling whose spacing varied approximately linearly with distance for the purpose of increasing the instrument speed by reducing the astigmatism and a photoelectric servo-system to stabilize to 1 sec of arc the solar image at various near-limb positions. The 970-3940-A range was covered in two sections with effective lambda/Deltalambda congruent with 30,000 from 1100 A to 1970 A. The spatial resolution was 2 x 60 solar sec of arc. During the Skylab mission 6400 exposures were made with the instrument pointed by an astronaut at selected and recorded'solar positions.
authors.forename: J D
authors.initials: JD
authors.lastname: Bartoe
authors.forename: G E
authors.initials: GE
authors.lastname: Brueckner
authors.forename: J D
authors.initials: JD
authors.lastname: Purcell
authors.forename: R
authors.initials: R
authors.lastname: Tousey