P3E1R1I1S1C3O1P3E1
15 points
PERISCOPE is validvalid
[n PERISCOPES]
a device (e.g. a tube with mirrors) by which an observer can look at something which is not in the direct line of sight [n -S]
[n PERISCOPES]
a device (e.g. a tube with mirrors) by which an observer can look at something which is not in the direct line of sight [n -S]