抄録
Using the theory of concave grating mounting published previously by Miyake in which a grating is rotated about a suitable axis to vary the wavelength, the author performs numerical calculations for the mounting in which property of imagery is almost of the same degree as that given by Seya mounting. In the solution which gives the minimum radius value of rotation, the angle subtended between incident and emergent rays is about 70° and this is near to the result obtained by Seya. There are other solutions which locate the center of rotation at infinity and therefore permit the rotation of grating to be replaced by a linear translation. Conditions for the linear translation to be used and properties of the imaging given by it are discussed. For these cases numerical calculations are performed. Moreover performance of the linear motion mounting is tested in visible region by taking photographs of spectral lines. (The content of this work will be published in English journal “Science of Light (Tokyo)” containing more details.)
