A man stood next to it, peeking through a slit in the vertical slats.
The female lays her eggs in a slit made by means of her "saw-like" ovipositor in the leaf or fruit of a tree.
Thus the Virgin river, a northern branch of the Colorado, has cut a vertical slit, 1000 ft.
Unfortunately considerations of luminosity compel the observer often to widen the slit much beyond the range within which the theoretical value of resolving power holds in practice.
When the slit is narrow light is lost through diffraction unless the angular aperture of this condensing lens, as viewed from the slit, is considerably greater than that of the collimator lens.
