that's the trouble with this place, everyone an expert! :-D
Royal Arsenal - The government foundry for casting cannon was formerly in Moorfields, and was removed to Woolwich soon after a great explosion in 1716, occasioned by moisture in the moulds. Andrew Schalch, a young German founder, who had been allowed to look at the moulds, gave warning of this explosion, and induced Colonel Armstrong, surveyor-general of the ordnance, and others to leave the ground; the operations proceed withstanding. the explosion took place, much damage was done, and several lives were lost. The government had resolved to remove the royal foundry to a distance from London, and Schalch, having been examined as to his qualifications, was appointed to select a suitable place. He chose the warren at Woolwich, the new works were erected under his superintendence, and he was appointed Master-Founder to the Board of Ordnance, an office which he held during sixty years. He died in 1776, at the age of 90, and was buried in the churchyard at Woolwich.