from the GNU version of the Collaborative International Dictionary of English
- n. A hole for looking through; a peephole.
from The Century Dictionary and Cyclopedia
- n. A hole to see through.
Sorry, no etymologies found.
I was waiting very carelessly, being now a little desperate, at the entrance to the glen, instead of watching through my sight-hole, as the proper practice was.
The officer of the gun sights through sight-hole, and orders
It consists practically of an ordinary compass box with a prism and sight-hole at one side, and a corresponding sight-vane on the opposite side.
When looking through the sight-hole the face of the compass-card can be seen by reflection from the back of the prism, and at the same time the direction of any required point may be sighted with the wire in the opposite sight vane, so that the bearing of the line between the boat and the required point may be read.
This was covered thick with frost crystals, but Bobby breathed on them, and rubbed them with the heel of his palm, and so acquired a sight-hole.
After more than two hours of incessant fighting, Lieutenant Worden having been temporarily blinded through the powder from an exploding shell which struck a sight-hole in the pilot-house of the "Monitor," through which he was watching the enemy, its command devolved upon Lieutenant Greene.
"A shell struck the forward side of the pilot-house directly in the sight-hole or slit, and exploded, cracking the second iron log and partly lifting the top, leaving an opening.