A large curved industrial enamel sign from the renowned Scottish engineering firm Sir William Arrol and Co Ltd, Glasgow. The sign is manufactured from heavy-gauge metal with a black vitreous enamel finish and white block-style lettering. The plate features a convex curve, indicating it was designed for mounting on a cylindrical or rounded component of a large crane or heavy hoisting machine. The text identifies the firm, the specific job (Job 5139), and the date 1951. It provides detailed safe working load instructions, specifying 50 tons for the main hook and 10 tons for the auxiliary hook. Sir William Arrol and Co Ltd were major manufacturers of industrial equipment and are world-famous for building landmark structures such as the Forth Bridge and London’s Tower Bridge.
Dimensions: 5ft x 32″.
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