The telescope mounted on the United States military rifle—the Krag-Jorgensen—does not consist solely of a corrected objective and a simple glass eyepiece, but contains a thoroughly corrected achromatic objective and complete achromatic eyepiece as well, which features fully develop the optical properties of the glass and give to the telescope an exceptionally large, flat and fully illuminated field, together with a remarkable long focal relief. The lenses forming the achromatic refracting systems are all made from the highest quality of optical glass, and so ground and arranged as to admit of no loss of light, thereby greatly increasing the illumination and definition. The non-breakable cross-hairs are placed exactly within the focus of the eye lens of the eyepiece and are distinctly seen under all conditions. All of the lenses are securely burnished into their cells, which are held in such a manner as to prevent the slightest movement from the sharpest recoil.
Farrow, Edward S. American Small Arms; a Veritable Encyclopedia of Knowledge for Sportsmen and Military Men. New York: Bradford, 1904. Print.
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