"Pen, ink and wash drawing made by Bob Vallance in 1967. The picture shows a traditional Native American device for transporting goods known as a travoir. Better known as a travois, the device is a simple v-shaped arrangement of poles with straps or wooden crosspieces towards the open end, onto which a load is tied. It is then pulled either by a horse or, with a smaller version, by a dog. The dog travois was in common use before the indigenous people of North America acquired horses from their contact with the Spanish colonists which occurred from the early 16th century onwards."
© Science Museum / Science & Society Picture Library