Griffeltavla
Griffeltavlor är en typ av skrivdon. Det är en personlig föregångare till svarta tavlan, ursprungligen gjord av svart skiffer och avsedd att skrivas på med antingen en griffel eller krita. Det skrivna kunde lätt suddas ut med en hartass (liksom på svarta tavlan[1]) eller en svamp.
Griffeltavlan har sina föregångare i sand- och lertavlor.
Referenser
- ^ Mellberg, Margaretha: "Lärare minns - läsning av en samling historiska lärarberättelser". Lararnashistoria.se. Läst 2012-08-27.
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Media som används på denna webbplats
Schiefertafelmitschwamm.jpg
Författare/Upphovsman: Peng, Licens: CC BY-SA 3.0
slate boards with sponge and rag. (~1950). however, slate boards where disappearing gradually circa 1930
Författare/Upphovsman: Peng, Licens: CC BY-SA 3.0
slate boards with sponge and rag. (~1950). however, slate boards where disappearing gradually circa 1930
Pacioli.jpg
It shows Pacioli standing behind a table and wearing the habit of a member of the Franciscan order. He draws a construction on a board, the edge of which bears the name Euclides. His left hand rests upon a page of an open book. This book may be his Summa de Arithmetica, Geometria, Proportioni et Proportionalità or a copy of Euclid. Upon the table rest the instruments of a mathematician: a sponge, a protractor, a pen, a case, a piece of chalk, and compasses. In the right corner of the table there is a dodecahedron resting upon a book bearing Pacioli's initials. An rhombicuboctahedron (a convex solid consisting of 18 squares and 8 triangles) suspends at the left of the painting. The identity of the young man at the right is uncertain, but one commentator recognizes the "eternal student" instructed by Pacioli. Some authors have also mentioned the possibility that the student is Dürer.
It shows Pacioli standing behind a table and wearing the habit of a member of the Franciscan order. He draws a construction on a board, the edge of which bears the name Euclides. His left hand rests upon a page of an open book. This book may be his Summa de Arithmetica, Geometria, Proportioni et Proportionalità or a copy of Euclid. Upon the table rest the instruments of a mathematician: a sponge, a protractor, a pen, a case, a piece of chalk, and compasses. In the right corner of the table there is a dodecahedron resting upon a book bearing Pacioli's initials. An rhombicuboctahedron (a convex solid consisting of 18 squares and 8 triangles) suspends at the left of the painting. The identity of the young man at the right is uncertain, but one commentator recognizes the "eternal student" instructed by Pacioli. Some authors have also mentioned the possibility that the student is Dürer.