periscope

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periscope 

An optical instrument using two right angle reflectors in order to allow observation of an object from behind a shield or around an obstruction where direct vision is impossible. It has many applications, especially in the military forces (e.g. in tanks, submarines). See periscopic lens.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in periodicals archive ?
This year has seen a mixture of high-flying businesses from North Wales selected - from a military periscope manufacturer to a food firm.
Quigg said each week they put together a planned Periscope broadcast that they'll cross-promote on Facebook and they also try to capture a breaking news event without promoting it.
In addition to improving submarine design flexibility by decoupling the control room's location from the optronics masts, the latter enhances control room ergonomics by freeing up space which would usually be occupied by the periscopes. Non-hull penetrating masts also can be reconfigured with relative ease with new systems and capabilities, and have fewer moving parts, thus reducing overall periscope life cycle costs and correspondingly the maintenance, repair and overhaul burden.
According to the US officials, the Jacksonville surfaced from periscope depth to check whether there was any damage inflicted on the unidentified vessel, which "continued on a consistent course and speed offering no indication of distress or acknowledgement of a collision."
He said: "Kent Periscopes has a fantastic worldwide reputation and the awarding of the contract is recognition of this.
When the mud and dirt are flying, you're gonna need the periscope washer and blower.
Possibly I am overlooking something here, but wouldn't a simpler, cheaper, and safer solution have been to just not use the periscopes they didn't think they needed?
Thomas Scott and Oliver Ray, nine, look through their periscopes. DJ150807SCIE1; MAGIC ACT...
When you look through the periscopes you can see various parts of the building, but with the images reversed, blurred and distorted, such as a beautiful view of a summer sky, which is actually the side of a tissue box.
The propeller must be there, so should the periscopes. The sub also came with a green plastic sea cradle which it could be displayed on.
Columns are reincarnated on the upper deck as light columns, periscopes against distant encircling mountains.
A project to incorporate laser eye protection into combat vehicle periscopes may remove the need for operators to wear goggles inside.