Simon Lake is attributed with the invention of the Periscope in 1902. However, Sir Howard Grub is known for perfecting this design.
You would use periscopes for spying or looking above a persons head
No, periscopes allow you to observe objects while you are hidden.
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There are two main types of periscopes: optical periscopes, which use mirrors to reflect light and provide a view of objects above the surface of the water, and digital periscopes, which use cameras and screens to provide a similar view. Optical periscopes are commonly used in submarines, while digital periscopes are becoming more popular due to advances in technology.
Big ships such as Navy's have periscopes and submarines have it too. If it is high for you to see you will use an periscopes.
the lydians
It could be said that submarine crews use periscopes, and that is probably the most common use of these devices.
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the African tribes
you invente what you want to do
submarine and steamboat