Here for your enjoyment is an image of the island of Porto Rico showing the lines of signal communication, telegraph, telephone, and heliograph, operated by the Signals Corps, U.S. Army, with military posts. It was created in 1900.
"Based on map furnished by the War Department, Adjuntant General Office, Military Information Division."
We have compiled this collection of photos to serve as a vital educational tool. Contact firstname.lastname@example.org for information or questions on this map.