3. His "Century of Inventions," printed from a re-written copy of his lost notes of 1655; and which names in the Dedication, the granting of the above Act.
The following list[6] comprises upwards of seventeen persons all living in 1663:—
4. Caspar Kaltoff, a confidential workman, engaged by the Marquis as his engineer in 1628, who died about 1664, and is honourably mentioned in the "Century."
5. Martha Kaltoff, wife of Caspar Kaltoff, who is named in letters patent dated 1672, as lately deceased. Her family was—
- Catharine, married to Claude Denis.
- Caspar Kaltoff, and his unmarried sister—
- Isabel Kaltoff.
6. Peter Jacobson, a sugar refiner, who married one of Kaltoff's daughters, had a portion of the buildings at Vauxhall, where the Water-commanding Engine was erected, and in operation from 1663, till at least to the year 1669, if not some years later.
7. William Lambert, another workman, a founder at Vauxhall, in the reign of Charles I., "under the Marquis of Worcester, for gun and waterwork, or any other thing founded in brass," in 1647, and who was living in 1664-5.
8. Christopher Copley, who had been a Colonel in the Parliamentary service, and was probably an iron master, having been the proprietor of four Iron Works. He assisted the Marquis at an early period and held a pecuniary interest in his invention of a Water-commanding Engine. Indeed it is highly probable that he was the "powerful friend" at whose instigation the "Century" was written in 1665.
9. The Earl of Lotherdale, written to in January, 1660, had a copy of the "Definition" of the Engine sent to him, and is promised an ingeniously contrived box or cabinet. He was appointed as late as March, 1665, to be one of a Commission to report on the affairs of the Marquis, and must, therefore, have been familiar with all matters relating to the noble inventor.
10. Dr. Robert Hook, the eminent mathematician, was acquainted with Caspar Kaltoff, and early in 1667, went purposely to see the engine working at Vauxhall, having read the "Definition."