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.
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.
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.
St Asaph-based Kent Periscopes and its partner DRS Technologies scooped a new pounds 910,000 contract to enhance the currently installed driver's night vision system on the Combat Reconnaissance Vehicle (CRV (T)).
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?
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.
Upper level with light columns like periscopes against distant encircling mountains.
I followed the lookouts down the ladder butstopped at the conning tower, positioning myself between the pair of periscopes.
M2 EQUITYBITES-October 3, 2016-Optex Systems awarded USD570,000 in new sales order for cable periscopes