Using the following differences:
1 - transparency manual thicker than thermal transparency.
2 - usually a broken thermal transparency comes (Parwma) in one of the four corners.
3 - usually comes transparency thermal colorful, handmade and transparency color does not come.
What better production transparencies educational Btrgih vertical or horizontal manner? Why?
The best is produced in a horizontal manner, and for the following reasons:
1 - in order to avoid and excluded from the defect associated with the device, which will be presented by Transparency later, and this defect is known defect angular deviation, we find that the rib top of the rectangle lit Budding from the device larger in size than rib bottom which will affect the contents of transparency when viewed in a vertical, and we can keep away from this drawback by tilting the screen that displays the content of the top forward even moderate Dhalaan upper and lower, but some teachers used the separation wall as a screen display of this device which can not address this defect so preferably produced in a horizontal manner.
2 - Some classrooms characterized upper ceiling Bdnu, and if vertical transparency are prepared in a way some of the contents of transparency likely to be distributed between the front wall of the students and the upper ceiling of the season which would upset the contents of transparency, so it's best production in a horizontal manner.
التسميات
Teaching Aids