APH Braille / Print Protractor: Part 11, Drawing tactile angles on the APH Draftsman

Uploaded by VideoTSBVI on 10.02.2010

A TSBVI Outreach Tutorial.
APH Braille/Print Protractor: Part 11,
Drawing tactile angles on the APH Draftsman, 90-degree, 70-degree and 110-degree angles.
Presented by Susan Osterhaus,
A Texas School for the Blind and Visually Impaired Outreach Math Consultant.
Okay, as I mentioned, I was going to show you another method.
The Sewell Raised-Line Drawing Board, I have used that for years and years,
but APH has since come out with what I consider a variation
of the Sewell Raised-Line Drawing Board.
It still has these little...
You know, the little clippies that you can clip the paper down with,
but it's not the flimsy paper that...
At least what I consider flimsy.
It now has this special film.
You noticed on the Sewell Raised-Line Drawing Board that I had to flip things over.
Well, watch. I'm not going to have to do that in this case.
Okay, let's pretend we're gonna start over again because this is a new type of drawing board.
Again, this is the APH Draftsman Drawing Board.
I'm gonna start out again to do that 90-degree angle.
And what I'm doing again is lining my arrow up with 90.
I am tightening my little screw down there.
I'm gonna place my hand carefully.
I think I'm gonna put it over to this side, so I'll have room for another angle over here.
Guys, you should have it memorized by now. This is the same technique.
Just make sure you've got a firm...
Fingers on that wand, fingers out of the drawing area.
You've got either with your thumb,
or, in this case, I've got the whole hand holding that down and the protractor.
Basically, the semicircle here portion of it.
Okay, I'm gonna... Again, I could use a ballpoint pen, and I am going to do that.
But I could also use... And I think I've lost it for the moment.
So, I'm just gonna use the ballpoint pen.
And that's what's so nice about having a ballpoint pen.
Even if you lose the little stylus that comes with this,
you just grab a ballpoint pen from wherever.
And I'm gonna do the same technique.
And notice I've stopped at the vertex.
This time, you are able... I hope to see it, that it is...
And I think the camera likes this one better. It's showing how pronounced that is.
So, you don't have to flip it over. It is drawing that up.
The tactile surface is on the same surface that you drew.
So, this is a wonderful thing about this particular instrument.
And you've now just drawn a 90-degree angle, and we can all see that.
That's pretty good.
Okay, now we're gonna go ahead and try that 70-degree angle.
Again, however, do a little shortcut or count backwards from 90.
I'm gonna do 45, 50, 55, 60, 65, 70.
Line that up. Make sure I've got that lined up.
Tighten it down, turn it over. Remember the whole thing?
And, again, very carefully, hold down my wand, hold down my...
And by the way, this is my technique. This is what works best for me.
If your students prefer, somehow, another way that works, don't fight them on that.
Whatever works best for them is what works.
Okay, so, we're gonna try this again. Again, they can feel it hit the vertex.
Come across, and you've got, now got a 70-degree angle.
I'm so excited about that. And we've got room.
I'm gonna go ahead and make the supplement which is...
I'm gonna turn this around just because, again, I like to get my thing lined up a certain way.
So, I'm gonna hold on to that, and I'm gonna kind of go this way,
and I have now done both 70- and my 110-degree angle.
**Captions by Project readOn**