The zero of the scale should be level with the surface of distilled water, and rise above it in proportion as increase of density causes less displacement.
The scale is graduated to thousandths—as far as ·040 only—because the sea water usually ranges between 1·014 and about 1·036. Only the last two figures need be marked.
LONDON:
Printed by George E. Eyre and William Spottiswoode,
Printers to the Queen's most Excellent Majesty.
For Her Majesty's Stationery Office.
FOOTNOTES:
[1] In South latitude the South wind corresponds to our North wind in its nature and effects. The Easterly and Westerly winds retain their respective peculiarities in both hemispheres.
[2] Exclusive of local land and sea breezes of hot climates.
[3] Glass, barometer, column, mercury, quicksilver, or hand.
[4] Or atmosphere, or the atmospheric fluid which we breathe.
[5] Or exhaustion.