Father Kavanagh [left] Ready. Photo by Marsh.
Further info from a newspaper photo caption in J.E. Maybee's scrapbook  (p.17):
REV. I.J. KAVANAGH, S.J., AND HIS UNIQUE DEVICE FOR EXAMINATION OF THE OUTER CORONA AND STREAMERS.
The telescope itself is merely an accessory. The framework attached thereto bore at one end a disc of such size as to block out the dazzling light of the inner corona, and facilitate visual examination, through the eye-piece, of the outer corona and streamers.