object lens

A low-power glass with large object lens to permit as much light as possible is a necessary condition for use at night.

The optical part of the work was done by Merz, Alvan Clark having declined the responsibility of dividing the object lens.

The face itself acts as a reflector projecting itself through the object lens in the center.

It is furnished with a double achromatic object-lens, about three inches aperture.

It if furnished with a double achromatic object-lens, about three inches aperture.