Don Daniel of Boller and Chivens demonstrating the spectrograph.

The second rectangular flange in front of Don Daniel’s hand is at the environmental boundary of the main seal area from outer space.                         CO2 cartridges from the main body would eject the support for the diagonal mirror in an emergency.

Environmental Cover Installed

Airlock Cover removed for installing Spectrograph Camera

Diagonal Mirror assembly can be extended, rotated and angle changed, and retracted

For more about Skylab, visit http://en.wikipedia.org/wiki/Skylab