Russ leaped from the chair and raced to the periscopic mirror.
Mr. Shelton, do you know anything about these periscopic binoculars?
The periscopic gun sight and the controls were on a level with the operator's eyes.
A pair of lenses thus equipped Dr. Wollaston called the periscopic microscope.
A very useful form of lens was proposed by Dr. Wollaston, and called by him the periscopic lens.
It didn't look like the periscopic eyes that those flying snakes had—looked more like a hexan eye, don't you think?
periscopic per·i·scop·ic (pěr'ĭ-skŏp'ĭk)
Of, relating to, or permitting the observation of objects from positions in or out of the direct line of sight.