A Beginner's Guide to ED Topa

Aim

As I had promised in my post on Jugaad, I am presenting the step by step procedure for light-tracing ED (Engineering Drawing) sheets.

Materials Required

1. Blank ED Sheets
2. Finished ED Sheet (to be copied)
3. Pencil, Eraser, Ruler etc.
4. Glass Sheet (At least the size of the ED sheets)
5. Clips - 3 Nos
6. Thick books
7. Working table

Procedure

1. Make two columns of books on the table to support the glass sheet.
2. Place the glass sheet on the books.
3. Place the lamp under the glass sheet in such a manner that it points upwards.
4. Place the ED sheets on top of one another and clip them together at 3 corners.
5. Place this arrangement on the glass sheet so that the blank ED sheet is on top.
6. Switch off the lights in the room.
7. Start copying!
8. It may not be very apparent which lines are dark and which are light. Use the fourth corner to check for thick/thin lines on the finished ED sheet.

Result

An exact copy of the original ED sheet.

Conclusion

Copying ED sheets does not require Rocket Science. Common sense is more than sufficient.

Precautions/Sources of Errors

1. The two columns of books must be of the same height. Increase/Decrease number of books as per requirement.
2. Check for thick/thin lines.
3. Erase off any traces of pencil marks created by the finished ED sheet on the backside of the new sheet. (Recall that they were in contact!)