Spectrohelioscope

Japanese: スペクトロヘリオスコープ(英語表記)spectrohelioscope
Spectrohelioscope
A device that allows visual observation of a monochromatic solar image by placing the eye on the photographing part of a spectroheliograph. It was invented by GE Hale in 1924. The solar image is moved at high speed, and a monochromatic image of part of the solar disk can be seen due to the afterimage of the eye. A prismatic prism is placed in front of the first and second slits of the spectroheliograph and rotated. With one rotation of the prism, the part of the solar image that enters the prismatic prism moves back and forth four times. When a diffraction grating is used to shine light of a specified wavelength on the second slit, a solar image of that wavelength is produced on the second slit.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
スペクトロヘリオグラフの撮影部に目を置いて,単色の太陽像を眼視観測ができるようにした装置。1924年G.E.ヘールによって考案された。太陽像を高速に移動させ,目の残像によって太陽面の一部の単色像を見ることができる。スペクトロヘリオグラフの第1と第2スリット前面に,角柱プリズムを置き,回転させる。プリズムの1回転に対し,角柱プリズムに入射した部分の太陽像は4回左右に移動を繰り返す。回折格子により所定の波長光を第2スリットに当てると,その波長の太陽像が第2スリットに生ずる。

出典 株式会社平凡社世界大百科事典 第2版について 情報

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