Figure 13 - A drawing of the anti-breakage coal boxes invented by Mr. S. Thomas. A trip wire is attached to the box and the jib of the crane. As the box is lowered into the hold of a ship the wire becomes taught and opens the box allowing the coal to be dispersed with minimal breakage. As the box is raised the wire slackens again and the box closes securely and automatically thus providing efficiency with safety. [178]