FR492422A - Periscope improvements - Google Patents

Periscope improvements

Info

Publication number
FR492422A
FR492422A FR492422DA FR492422A FR 492422 A FR492422 A FR 492422A FR 492422D A FR492422D A FR 492422DA FR 492422 A FR492422 A FR 492422A
Authority
FR
France
Prior art keywords
periscope
periscope improvements
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Other languages
French (fr)
Inventor
Washington Baker Vanderlip
Ernest Freshfield Dent
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ERNEST FRESHFIELD DENT
Original Assignee
ERNEST FRESHFIELD DENT
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ERNEST FRESHFIELD DENT filed Critical ERNEST FRESHFIELD DENT
Application granted granted Critical
Publication of FR492422A publication Critical patent/FR492422A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/02—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors
    • G02B23/08—Periscopes

Landscapes

  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
FR492422D 1916-08-18 1916-10-07 Periscope improvements Expired FR492422A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB492422X 1916-08-18

Publications (1)

Publication Number Publication Date
FR492422A true FR492422A (en) 1919-07-08

Family

ID=1528293

Family Applications (1)

Application Number Title Priority Date Filing Date
FR492422D Expired FR492422A (en) 1916-08-18 1916-10-07 Periscope improvements

Country Status (1)

Country Link
FR (1) FR492422A (en)

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