National Geographic : 1939 Oct
DOWN THE RIO GRANDE 441 "SIT STILL! YOU NEEDN'T CLIMB OUT-THIS TEXAS BUMP GATE SHUTS ITSELF!" Cowboys invented this labor saver. Amidships the heavy gate turns on the upright pole. Bumped open by the car, the ropes twist; untwisting, they close the gate on a sheep ranch near Del Rio. Photographs by Luis Marden "WHEN MY MULE FEELS A SLOW LEAK COMING, HE BALKS-HE WON'T PULL ON A FLAT TIRE" Roman chariots may have been gilded and shaped with more grace, but they never knew the ease of pneumatic tires. In Laredo, Texas, now no vehicle with old-fashioned iron tires is allowed.