Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The red sticky dots on the towers were added after the experiment to facilitate telling approximate tower height from the pictures. Starting from the bottom of the construction and going up, we attached one dot at every 5cm.
