Is this website correct about two types of Orthographic projection?

Question

Is this website correct about two types of Orthographic projection?

http://www.secondarydandt.org/data/files...

The example using camera of first angle and third angle projection confuse me.I thought they were really just the same first/third angle but laid out differently on page. However in their examples they they are different views.

Answer 1

link is dead

Answer 2

Your link doesnt work, but the difference between the two is that one shows one side of the object and the other shows the other. Your hidden dotted lines would be different on the two types.

Answer 3

link is not working