This is the Coat of Arms for the Society of Mineral & Battery Works. This company was incorporated at the same time as the Company of Mines Royal, but it had a different function. It focused on manufacturing goods out of metal. They worked with Brass, Copper, Iron and Bronze. Brass is an alloy of copper and zinc and the odd looking item held up by the arms at the top is a lump of calamine or zinc ore.
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The women on the left is “Science” and holds a dowsing rod. The man on the right is “Labour” and holds a panel beating hammer. Both have a symbol for knowledge on their heads.