MEASUREMENT OF ALTITUDES BY DIFFERENCES OF ATMOSPHERIC PRESSURE:--
Historical Note--Mercurial Barometer--Construction--Operation--
Aneroid Barometer--Construction--Various Improvements--Hypsometer 548
CHAPTER XVIII.
Surveying and Levelling Instruments, Theoretically and Practically Described. For construction, qualities, selection, preservation, adjustments, and uses; with other apparatus and appliances used by civil engineers and surveyors in the field. · 第 18 / 26 章