CHAPTER XVI. MISCELLANEOUS INSTRUMENTS.
145. CHEMICAL WEATHER GLASS.
146. LESLIE'S DIFFERENTIAL THERMOMETER.
147. ROMFORD'S DIFFERENTIAL THERMOMETER.
148. GLAISHER'S THERMOMETER STAND.
149. THERMOMETER SCREEN, FOR USE AT SEA.
150. ANEMOSCOPE.
151. EVAPORATING DISH, OR GAUGE.
152. ADMIDOMETER.
153. CLOUD REFLECTOR.
154. SUNSHINE RECORDER.
155. SET OF PORTABLE INSTRUMENTS.
156. IMPLEMENTS.
157. HYDROMETER.
158. NEWMAN'S SELF-REGISTERING TIDE-GAUGE.
TABLES.
PAGE
Table of Corrections, for Capillary Depression of the Mercury in Boiled and in Unboiled Barometer-Tubes 6
Tables for Deducing Heights by means of the Barometer:--
No. 1. Approximate Height due to Barometric Pressure 42
No. 2. Correction for Mean Temperature of Air 44
No. 3. Correction due to Latitude 44
No. 4. Correction due to Approximate Elevation 45
Tables for Determining the Temperature of the Vapour of Boiling Water at any Place:--
No. 5. Factor due to Latitude 62
No. 6. Temperature and Tension 62
Table of Temperature of the Soil 69
Table of Difference of Elevation corresponding to a fall of 1 deg. in the Boiling-point of Water 98
Table showing Proportion of Salt for various Boiling Temperatures of Sea-Water 100
Table for finding the Degree of Humidity from Observations with Mason's Hygrometer 108
Table showing Amount and Duration of Rain at London, in 1862 112
Table of Average British Rainfall in Westerly, Central, and Easterly districts 114
Table showing Force of Wind, for use with Lind's Wind-Gauge 118
Tables for Correcting Observations made with--
Brass Hydrometers 142
Glass Hydrometers 143
ADDENDA.
PAGE
1. Rule for converting Millimetres into Inches, et vice versa 146
2. Old French Lineal Measure, with English Equivalents 146
3. Rule for finding Diameter of Bore of Barometer Tube 146
4. Wind Scales 147
5. Letters to denote the State of the Weather 147
6. Table of Expansion of Bodies 148
7. Table of Specific Gravity of Bodies 148
8. Important Temperatures 148
9. Table of Meteorological Elements, forming Exponents of the Climate of London 149
10. List of Works on Meteorology 151
METEOROLOGICAL INSTRUMENTS.
In the pursuits and investigations of the science of Meteorology, which is essentially a science of observation and experiment, instruments are required for ascertaining, 1. the pressure of the atmosphere at any time or place; 2. the temperature of the air; 3. the absorption and radiation of the sun's heat by the earth's surface; 4. the humidity of the air; 5. the amount and duration of rainfall; 6. the direction, the horizontal pressure, and the velocity of winds; 7. the electric condition of the atmosphere, and the prevalence and activity of ozone.