" The No. 35 sight, seen in illustration from 1906 catalog at right, featured a slightly-elevating slide that was easily turned to one side to allow removal of the bolt. It had a specially constructed base that allowed it to be easily attached to the bolt stop. It did not interfere with loading from clips when mounted on the rifle. The sight required a front sight of a special height."
US Patent 798,474 - Sight for Firearms, James Windridge.
Lyman Centennial Journal 1878-1978, page 85 ASIN: B000BY58S4
For those with an inquisitive mind, consider the Williams Foolproof Target sights that mount onto a mounting rail, like those on a Remington 540X.
Dual Aperture on Model 35
Small Aperture on Model 48
Kraschenbirn from Cast Bullets says:
The Lyman 48 on my 1898 Krag "sporter" has that same dual-aperture arrangement. The small-aperture insert hinges forward to unmask a larger aperture for low-light shooting conditions. When I first acquired the rifle, I got in touch with Lyman who replied that my sight (from mfg code #s, and patent dates) was manufactured between 1919 and 1922.
Note that the small aperture pivots on a cross-pin at the bottom of the opening. The catch for the small aperture is that small, upright tab in the front center of the aperture. [Ed.]
Small Aperture Up (from Kraschenbirn)
Small Aperture Down (from Kraschenbirn)
Model 48 on Krag (from Kraschenbirn)
If you have further information on the No. 35, drop me a NOTE
Dual Aperture on Model 35
Small Aperture Sight Up
Small Aperture Sight Down
Model 48 on Krag
