Old school IT

so today i made a timeline on old school IT

heres a link to the pretty web site 

https://www.timetoast.com/timelines/1168789

so now for the question that caused me to look at all this old school stuff. 

describe 2 disadvantages of delivering a presentation using printed acetate.

and my answer to that dear friend is. 

1) if the light bulb is blown in the projector then it will not work and become useless. also it is very expensive to any broken equipment in these machines. 

2)you have to take into account the angles in which you put the acetates on. because you dont want them to show upside or with the words back to front. 

ta-dah and thats my answer. totally worth 4 points