FR919139A - Dispositif optique - Google Patents

Dispositif optique

Info

Publication number
FR919139A
FR919139A FR919139DA FR919139A FR 919139 A FR919139 A FR 919139A FR 919139D A FR919139D A FR 919139DA FR 919139 A FR919139 A FR 919139A
Authority
FR
France
Prior art keywords
optical device
optical
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
English (en)
Inventor
Edwin Richard James
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 filed Critical
Application granted granted Critical
Publication of FR919139A publication Critical patent/FR919139A/fr
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L13/00—Drawing instruments, or writing or drawing appliances or accessories not otherwise provided for
    • B43L13/14—Devices for drawing in perspective
    • B43L13/16—Devices for drawing in perspective free-hand
    • B43L13/18—Devices for drawing in perspective free-hand having optical or projecting equipment
FR919139D 1944-12-20 1945-12-15 Dispositif optique Expired FR919139A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB919139X 1944-12-20

Publications (1)

Publication Number Publication Date
FR919139A true FR919139A (fr) 1947-02-27

Family

ID=10707901

Family Applications (1)

Application Number Title Priority Date Filing Date
FR919139D Expired FR919139A (fr) 1944-12-20 1945-12-15 Dispositif optique

Country Status (1)

Country Link
FR (1) FR919139A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3227043A (en) * 1962-08-30 1966-01-04 Ernest J Swimmer Camera lucida drawing instrument with intensity control

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3227043A (en) * 1962-08-30 1966-01-04 Ernest J Swimmer Camera lucida drawing instrument with intensity control

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