Based on the IGC clue that Harriss was a son in law to William Trulock, I went on to Ancestry. I found the connection.

William Trulock's daughter Elizabeth Georgina was married on 4 June 1846 in St. Anne's Parish, Dublin, Ireland to Joseph Harriss. Her address is given as Dawson Street. They had two sons, John Trulock Harriss & Henry "Harry" Joseph Harriss.

I also found this little article, probably written by the firm themselves, published in 1893.

Tim

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