@misc{indiciae4dfc5b7ac3be,
  title = {The Spectrohelioscope.},
  author = {G E Hale},
  year = {1924},
  doi = {10.1073/pnas.10.8.361},
  url = {https://pubmed.ncbi.nlm.nih.gov/16576836/},
  note = {Source identifier: 16576836}
}