Photographed with the spectroheliograph, using the light emitted by glowing calcium vapor.
"The New Heavens" by George Ellery Hale
Taken with the Spectroheliograph of the Kenwood Observatory, Chicago, by Professor George E.
"A Popular History of Astronomy During the Nineteenth Century" by Agnes M. (Agnes Mary) Clerke
I moved to the lens-box of the spectroheliograph.
"Astounding Stories of Super-Science April 1930" by Various
In the subterranean chamber is the spectroheliograph of exceptional size and power.
"Astronomy" by David Todd
The launch of the second generation of solar instruments, the NRL spectroheliograph on Skylab and SM M led to lists by Widing et al. (1982) of solar ﬂare lines in the 170345 ˚A range, and by Phillips et al. (1982) of the ﬂare lines in the 5.7 – 19 ˚A range.
Atomic Data for X-ray Astrophysics