🛠️ Invention or technique

Submarine periscope

Periscopio submarino

Date
1901-1902 · confidence medium
Place
Dublin, Ireland
Credited to
Howard Grubb; Simon Lake
Field
Communication

⚠️ Disputed: the sources disagree.

What it is

A tube with mirrors or prisms and lenses that lets a submerged submarine view the surface. Grubb designed in Dublin the periscope of the Royal Navy's first Holland submarines.

Marie-Davy built a periscope in 1854 and Lake used one in his 1902 submarine; Grubb designed that of the 1901 Holland submarines. Priority is debated and varies by type.

What it led to

  • submarines able to see the surface in naval warfare
  • tank and trench periscopes
  • military prism optics
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Sources✓ verified 2026-11-06