The electrostatic spectrograph was constructed of segments of two cylinders and was enclosed in an evacuated iron box.
It was enclosed in an evacuated iron box. The electrostatic spectrograph was constructed of segments of two cylinders.
The electrostatic spectrograph was constructed of segments of two cylinders. It was enclosed in an evacuated iron box.
The electrostatic spectrograph was constructed of segments of two cylinders. It was enclosed in an evacuated iron box.