“ These Experiments are to be repeated every New Voyage, the multitude and frequency of them being necessary for finding out and confirming the truth of them; which as it will conduce exceedingly to the Enlargement of Natural Knowledge, so it may in time produce New and more accurate Sea-Maps and Cards, than hitherto have been publisht; and great helps and advantages to Navigation: especially those of the Variation, and Dipping of the Needle; the Depth and Saltness of the Water, the Nature of the Ground at the Bottom of the Sea ”

“ Nor how by the help of these, the Azimuth required may, to Degrees, if not nearer, be found out upon a good Globe or Planisphere, (whereof there is a design to have one, that is, the Analemma, contrived into a form of Instrument for the use of the publick, and that ere long; which will with great facility perform all that the Globe can do, with much more exactness and conveniency) that being sufficiently known. ”

“ To carry with them good Scales and Glass-Viols of a pint or so, with very narow mouths, which are to be fill'd with Sea-water in different degrees of Latitude, and the weight of the Viol full of water taken exactly at every time, and recorded; marking withall the degrees of Latitude and Longitude of the Place, and the Day of the Month, and the Temperature of the Weather: And that as well of Water near the Top, as at a greater Depth. ”

“ The various Degrees of Saltness of the Sea-water, in several places, and at several Depths at the same place. If besides Astronomical things, to be hereafter lookt into, the following Experiments be carefully made, and Directions observed by as many Ingenious Persons, as have opportunity, it may fairly be hoped, that from multitudes of Experiments and Observations, such Rules may be framed, as may be of inestimable use for Seamen. ”

“ THough the Art of Navigation, one of the most useful in the World, be of late vastly improved, yet remain their many things to be known and done, the knowledg and performance whereof, would tend to the accomplishment of it: As the making of exact Mapps of all Coasts, Ports, Harbors, Bayes, Promontories, Islands, with their several Prospects and Bearings ”

“ Again the Ball (A) and the Lead (B) whose Nail was bended into a sharper Angle; the Ball returned in 39 strokes. A second time repeated with the same success at the same depth.
Ball (B) Lead (B:) in which trial the Line, not being clear, stopped a little the motion; the Ball returned in 47 at the same depth.
Ball (A) Lead (A) at 8 fathom and 1 foot, returned at 20; repeated at 8 fathom, returned at 19. ”

“ In some of the Trials already made 'with this Instrument, the Globe being of Maple-wood, well covered with Pitch, to hinder soaking in, was 5 inches in Diameter, and weighed 21⁄2 pounds; the Lead, of 41⁄2 pounds weight, was of a Conical (but is now used of a Globous) Figure 11 inches long, with the sharper end downwards, 1 at the bottom in Diameter. And, in those Experiments made in the Thames, in the depth of 19 foot water, there passed between the Immersion and Emersion of the Globe, 6 Seconds of an hour ”