Abstract: A selectively adjustable firearm scope mount is provided which includes a base for mounting to a firearm and a rib for receiving a scope assembly. The rib is preferably selectively positionable relative to the base as determined by a selected one of a plurality of individually and independently adjustable stops. The stops correspond to and are adjusted according to different ranges or cartridge loads and thus the selected relative position between the rib and the base. The stops are preferably carried by a rotatable turret presenting indicia corresponding to the various stops, each stop being positioned within a cavity. The turret may be fixed against undesired rotation by a catch. A pin is removable and replaceable without the need for tools thereby permitting ready substitution a new rib with scope assembly mounted thereto as a modular unit.

Abstract: A selectively adjustable firearm scope mount is provided which includes a base for mounting to a firearm and a rib for receiving a scope assembly. The rib is preferably selectively positionable relative to the base as determined by a selected one of a plurality of individually and independently adjustable stops. The stops correspond to and are adjusted according to different ranges or cartridge loads and thus the selected relative position between the rib and the base. The stops are preferably carried by a rotatable turret presenting indicia corresponding to the various stops, each stop being positioned within a cavity. The turret may be fixed against undesired rotation by a catch. A pin is removable and replaceable without the need for tools thereby permitting ready substitution a new rib with scope assembly mounted thereto as a modular unit.

Abstract: In a long line data acquisition system, an input network is provided for coupling the lines to a data acquisition unit. The network includes the cascade combination of a first filter presenting a low pass frequency response to common mode voltage and a second filter presenting a low pass frequency response to difference mode voltage. The output of the second filter is coupled to an amplifier having high common mode rejection. The network substantially reduces, at the amplifier input, both common mode and difference mode noise picked up by the lines.