|From The Ancient Port of Whitby and Its Shipping, accessed on Google Books|
I tried to see what I could find about the “Hippogriff” elsewhere on the net, and was unable to find an image, but was able to find a description in the book, The Ancient Port of Whitby and Its Shipping, on Google Books. It was described as a “brig” with a 196 ton capacity, built in 1832, and owned by “Thos. Mills, R.H. Bay”. (A brig is a two-masted, square-rigged ship with an additional gaff sail on the mainmast). It was “lost off Yarmouth” in March 1870, which could have been during Joseph’s period of indenture. I was able to find a newspaper notice on line from the London Times, dated March 5, 1870: “The schooner Hippogriff, Miller master, of Whitby, was totally lost on the Scroby Sands, near Great Yarmouth, yesterday, and it is feared that all the crew perished. A boat and medicine chest was washed ashore”. (The “Scroby Sands” is a sandbank off the coast of Norfolk, and the site of many shipwrecks). If there were no survivors, then Joseph could not have been on that ship at the time.
Of note is that Captain Cook also was indentured in the Merchant Navy, and also out of Whitby.