The determination in the case of solids lighter than water is effected by the introduction of a sinker, i.e.
Nitzsch, Dillmann, Ritschl and Sinker are convinced that the book was not a translation but was written originally in Greek.
If W be the weight of the experimental solid in air, w the weight of the sinker in water, and W, the weight of the solid plus sinker in water, then the relative density is given by W/(W+w - Wi).
Second only to the compass in its value to the sailor is Thomson's sounding apparatus, whereby soundings can be taken in 100 fathoms by a ship steaming at 16 knots; and by the employment of piano-wire of a breaking strength of 140 tons per square inch and an iron sinker weighing only 34 lb, with a selfregistering pressure gauge, soundings can be rapidly taken in deep ocean.
Gael says: I once fell hook, line and sinker for a boy on the strength of his big quiff!