Seeking records of Chickering & Sons of Boston

Sorry I am late in responding to your question . Alger Iron Works in South Boston cast piano plates for Chickering & Sons. Cyrus Alger had developed a method of giving cast iron 2 to 3 times the strength it had previously using a process involving air. His castings where so strong that he became so famous he cast cannons for the military ordnance department. Many of his cannons where used in coast defense and a large part of his property in South Boston was used to cast long cannons as well as short portable cannons. The company later became the South Boston Iron Works. I am pursuing some archived records I found out about that are at an offsite location in Maryland. These are described as records and ledgers belonging to Alger and Reed .  Unlike Steinway & Sons, Chickering & Sons did not have their own foundry

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