In addition to a previous post here are some shots of the ceremonial Aberdeen granite foundation stones from 3rd August 1910
One laid by Alderman Joseph McLauchlan, the initiator of the scheme and Lieut. Colonel T. Gibson Poole the Mayor. The contractors Sir William Arrol were also involved in the Tay Bridge, Forth Bridge, Tower Bridge, Severn Bridge and Humber Bridge.
The £84,000 bridge was opened on 17 October 1911 by Prince Arthur of Connaught.
If Wikipedia is to be believed, the man seen falling from the bridge during the opening ceremony is Arthur Darwin, a relative of John “Seaton Canoe” Darwin.
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Sir William Arrol also designed the gantries at Harland & Wolff Shipyard that were used to construct RMS Titanic.