"The bronze powder business, however, no longer required my personal attention, and was well managed by those I had chosen as the guardians of a secret, which was long and honourably kept"

Henry Bessemer was referring to the bronze powder business he had actually developed. He had chosen people to manage the business and they had actually kept the trick of the business for a very long time. This was a source of pride for Bessemer, as he had actually turned over the business to individuals he relied on and they had actually kept the trick for a long time. He no longer required to personally attend to the business, as it was being handled well by those he had selected. This quote shows that Bessemer believed individuals he had actually chosen to handle the business and that he took pride in the reality that they had kept the trick for a long time. It likewise shows that he was positive in his decision to delegate business to them and that he was pleased with the method they were managing it.