guess is the Veely had a flat tire
This probably wasn't the same outing as the Family Picnic photo. Different hats on the men. As far as I can tell the man on the left is Martyn Sr. and the man pumping is Martyn Jr. I'm not sure who the kids are.
size = 6" W x 4" H
This is probably inacurate, my picture is a photocopy