DE189981C - - Google Patents

Info

Publication number
DE189981C
DE189981C DE1906189981D DE189981DA DE189981C DE 189981 C DE189981 C DE 189981C DE 1906189981 D DE1906189981 D DE 1906189981D DE 189981D A DE189981D A DE 189981DA DE 189981 C DE189981 C DE 189981C
Authority
DE
Germany
Prior art keywords
observing
eye
additional
optical
magnifying glass
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 - Lifetime
Application number
DE1906189981D
Other languages
German (de)
English (en)
Filing date
Publication of DE189981C publication Critical patent/DE189981C/de
Application filed filed Critical
Priority to AT34663D priority Critical patent/AT34663B/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G02B23/16—Housings; Caps; Mountings; Supports, e.g. with counterweight

Landscapes

  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Telescopes (AREA)
DE1906189981D 1906-09-13 1906-09-13 Expired - Lifetime DE189981C (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT34663D AT34663B (de) 1906-09-13 1907-10-23 Einrichtung an monokularen optischen Instrumenten zur Vermeidung des Ermüdens des nichtbeobachtenden Auges.

Publications (1)

Publication Number Publication Date
DE189981C true DE189981C (fr)

Family

ID=453480

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1906189981D Expired - Lifetime DE189981C (fr) 1906-09-13 1906-09-13

Country Status (1)

Country Link
DE (1) DE189981C (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3836238A (en) * 1973-05-09 1974-09-17 Tropel Viewable target system for eye examining instrument

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3836238A (en) * 1973-05-09 1974-09-17 Tropel Viewable target system for eye examining instrument

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