It seems it would be easier to have one of these vs numerous templates.
That's what I was heading, thanks. Ink as in you dip it into a bottle of ink.
templates like French curves are use for elevation lines.
Anyone that does a lot of wood working will use them for laying out curves and scrolls.
As an architect I do all my house and small buildings by hand. I do a much better job of lay out and design on paper. Auto Cad is fine for some things. I find nice German and American drafting sets in the case for $10 to $20. There is really no value in an odd lot. They are so common that they are almost not wroth the price of shipping in a $5.35 little flat rate box. You are also missing parts and extensions. Sometimes they are nice for doing lay out work on sheet metal. If you know how to lay out sheet metal and leave enough for folds and bends. There is an exact science to it You can use them to lay out duct work if you are making it up. There are hundreds of uses for them. Many model rail roads are laid out with drafting tools. You can find the grade for elevation and get the right grade to scale and get the right curves to scale. A little trig and drafting skills can be used in many things.
I still do all my renderings by had. I don't draw them up with Auto CAD. I have the program and use it for Plot plans and some commercial buildings.
Be careful. You can draw things you can not build and never see it on paper.
Auto CAD is great for CNC machines, civil engineering and all forms of Engineering. Architects still need to know how to draw and sketch. I can draw a house faster than you can do it with Auto CAD and I don't care how good you are.
The bottom line is they are worth keeping. Not worth the gas to pick them up.