Note 55 — Chapter VIII · METHOD OF TAKING PICTURES FOR THE STEREOSCOPE.
Reading edition
It is only in a horizontal direction that we can see 180° of the hemisphere. We would require a circle of eyes 2½ inches distant to see a complete hemisphere.
Reading edition
It is only in a horizontal direction that we can see 180° of the hemisphere. We would require a circle of eyes 2½ inches distant to see a complete hemisphere.