pinhole

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Related to pinholes: Pinhole Photography

pinhole

(pĭn′hōl) [AS. pinn, pin, + hol, hole]
A small perforation made by, or the size of that made by, a pin.

pinhole os

A very small opening to the uterus from the vagina. It may be present in very young women.
References in periodicals archive ?
Low Voltage Pinhole Detector-Advanced (LD8105) comes in a hardboard box with the following items: Low Voltage Pinhole Detector, Sponge Wand, grounding cable with clamp and user manual.
As pinholes in aluminum are very rare, it is correspondingly difficult to find test samples that can be used to measure the influence of aluminum pinholes.
Sensitivity is recovered by using large sets of pinholes (7 and 19), whose opening angle limits the size of the field of view, thus minimizing the overlap of individual images.
If they look deep, the next step usually is to cross section a few pinholes and look at them under a higher power microscope (100-400X).
At the very early stage of exposure (30 h), the neat sample shows appearance of pinholes and cracks on the surface.
To test if the students' cameras are light safe, I give each student a small piece of photo paper and have them seal their cameras and cover their pinholes.
This is accomplished by collecting emission photons that normally are rejected by the emission side pinhole, traditionally used at the 1 airy disk size.
If both pinholes are open and some of the waves coming from pinhole 1 cross-interfere with waves coming from pinhole 2 in the space before the lens, there will remain a contribution by pinhole 2 at image 1 that will compensate exactly the decrease of quantum waves contributed by pinhole 1 at image 1.
Judy uses the empty cans for pinhole photography ( the most basic way to create photographic images.
Pinholes -- What might be causing pinholes on 20-lb bag paper?
The MERLIN cameras feature precision-drilled pinholes, magnetic shutters and childproof openers.