DE42371C - Projections school blackboard - Google Patents

Projections school blackboard

Info

Publication number
DE42371C
DE42371C DENDAT42371D DE42371DA DE42371C DE 42371 C DE42371 C DE 42371C DE NDAT42371 D DENDAT42371 D DE NDAT42371D DE 42371D A DE42371D A DE 42371DA DE 42371 C DE42371 C DE 42371C
Authority
DE
Germany
Prior art keywords
projections
school blackboard
blackboard
school
unfolded
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
DENDAT42371D
Other languages
German (de)
Original Assignee
J. EMELE in Wiesloch, Baden
Publication of DE42371C publication Critical patent/DE42371C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
    • G09B23/02—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for mathematics
    • G09B23/04—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for mathematics for geometry, trigonometry, projection or perspective

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computational Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Pure & Applied Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Algebra (AREA)
  • Business, Economics & Management (AREA)
  • Geometry (AREA)
  • Educational Administration (AREA)
  • Educational Technology (AREA)
  • Theoretical Computer Science (AREA)
  • Toys (AREA)
  • Drawing Aids And Blackboards (AREA)

Description

Hierzu 1 Blatt Zeichnungen.1 sheet of drawings.

BERLIN. GEDRUCKT IN DER REICHSDRUCKEREI.BERLIN. PRINTED IN THE REICH PRINTING COMPANY.

Claims (1)

Patent-Anspruch:Patent claim: Eine zum Aufziehen und Niederlassen eingerichtete Schultafel, bestehend aus drei mittelst Scharnieres verbundenen Theilen, welche sich derart aufklappen lassen, dafs sie zusammen die drei Projektionsebenen darstellen.A blackboard set up for pulling up and sitting down, consisting of three medium-sized Hinge connected parts, which can be unfolded in such a way that they together the represent three planes of projection.
DENDAT42371D Projections school blackboard Expired - Lifetime DE42371C (en)

Publications (1)

Publication Number Publication Date
DE42371C true DE42371C (en)

Family

ID=317774

Family Applications (1)

Application Number Title Priority Date Filing Date
DENDAT42371D Expired - Lifetime DE42371C (en) Projections school blackboard

Country Status (1)

Country Link
DE (1) DE42371C (en)

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