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Diameter of object lens 2-3/4 in., diameter of ocular lens 1 in.

The objective, or object lens, stands in front of the slide.

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

These have been overcome, one after another, until it is now felt that the best modern telescope, with an object lens of twenty-six inches, has fully reached the limit of optical power.

The field of the great object lens was already suffused with the radiance of her approach.