In this way the scale can be viewed by a microscope of much higher magnifying power than can be employed for the photographed spectrum.
Photographed by Professor C. D.
The adoption of a reseau photographed upon the plate has greatly facilitated the procedure.
By the use of photography, however, it is possible to photograph the trail of a star as it transits the meridian when the telescope is directed towards the north, and another trail be similarly photographed when the telescope is directed towards the south.
2 (Plate), shows the minute complex of the tin-lead eutectic, photographed by J.