Emphasis was usually put on the horizontal acceleration factor, for the simple reason that ordinary structures have a built-in safety factor for the vertical component; that is, gravity.
![Emphasis was usually put on the horizontal acceleration factor, for the simple reason that Emphasis was usually put on the horizontal acceleration factor, for the simple reason that Image](https://www.idlehearts.com/images/emphasis-was-usually-put-on-the-horizontal-acceleration-factor-for-the-simple-reason-that.jpg?x85372)
Emphasis was usually put on the horizontal acceleration factor, for the simple reason that ordinary structures have a built-in safety factor for the vertical component; that is, gravity.