graph question

[Susan Baker]

Hello!
The attached cartesian has only the values identified on it as -10 and 10 for both the x- and y-axis. (I'm not worried about the A and B points plotted on the graph) I am hoping it has attached--it is difficult to read. Would I only put in the -10s and 10 when making my graph? Or do I put in the range that will fit (probably even numbers), even though the sighted students would not have access to that and would have to count? Thank you very much for any assistance. I did not find anything about that specific issue in the TG book.
Susan

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[Lindy Walton]

Cartesian graph

Guideline 6.6.2 of the Tactile Graphics guidelines gives only a few remarks about Cartesian Graphs. 6.6.2.1 says that numeric indicators should not precede the numbers on the x-axis and y-axis lines. (I don't know if the supplement of braille examples is available yet.)

My recommendation is to include only what is in the print copy, that is, braille the 10s and the -10s, aligning as you would in a number line only without the numeric indicators. Because the graph is isolated in this example (there is only one of them on this page) I would reproduce exactly what you see in print.

As a side comment, having brailled hundreds of these graphs, within a chapter full of Cartesian graphs I do not feel that it is necessary to reproduce all 400 dots for every single graph. The first graph should be shown in full, but following graphs in the chapter can be simplified. You can tell the reader in a transcriber's note that all squares or dots or tic marks on the x- and y-axis scale are "one unit" which eliminates the need to constantly show the 10s and -10s (which often get in the way of the graph line). You also need not show the entirely empty quadrants, as long as you include the origin and a few units above/below/left/right of it for orientation within the plane. I would apply these suggestions only to high school and levels above that.

**IF THE SCALE CHANGES you must be very sure to show a full graph grid and include all labels. A TN telling the reader that the scale has changed in the next graph is very important.

As always, I welcome comments to the contrary.

[Susan Baker]

Thank you very much!

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