Hygrometric Substances
The instruments devised for the purpose of ascertaining the humidity of the atmosphere are termed <em>hygrometers</em>. The earliest invented hygrometers were constructed of substances readily acted upon by the vapour in the air, such as hair, grass... Importance Of Self-registering Thermometers
Heat being apparently the most effective agent in producing meteorological phenomena, the determination of the highest temperature of the day, and the lowest during the night, is a prime essential to enable an estimate of the climate of any place t... Instructions For The Sea-coast Barometer
The directions for fixing the barometer, and making it portable when it has to be removed, should be attended to carefully. The barometer should be suspended against a frame or piece of wood, so that light may be seen <em>through</em> the tube. Othe... Johnson&rsquos Metallic Deep-sea Thermometer
The objection to the employment of mercurial thermometers for ascertaining the temperature of the ocean at depths, arising from the compression of the bulbs, which was of such serious consequence previous to the modification made in the constructio... King&rsquos Self-registering Barometer
<div>Fig. 27.<br> <img src="/images/fig27.jpg" alt=""></div> <p><br> Mr. Alfred King, Engineer of the Liverpool Gas-light Company, designed, so long ago as 1854, a barometer to register, by a continuous pencil-tracing, the variations in the weight... Laws Of Rain-fall
Tropical countries have a dry and a wet season during the year: <em>dry</em>, when the sun is at the opposite side of the equator; <em>wet</em>, when the sun is overhead. With reference to the British Isles, the statistics collected by Mr. G. J. Sym... Leslie&rsquos Differential Thermometer
<div>Fig. 93.<br> <img src="/images/fig93.jpg" alt=""></div> <p><br> A glass tube having a large bulb at each extremity, and bent twice at right angles, as represented in figure 93, containing strong sulphuric acid tinged with carmine, and suppor... Leslie&rsquos Hygrometer
This instrument consists of a glass syphon tube, terminated with a bulb or ball at each end, turned outwards from each other, as in fig. 76. The tube is partly filled with concentrated sulphuric acid, tinged by carmine. One of the balls is covered s... Lightning Conductors
;The line of danger, whether from the burning or lifting power of lightning, is the line of strong and obstructed currents of air, of the greatest aerial friction.” Trees, church spires, wind-mills and other tall structures, obstruct the aeria... Marine Thermometer
<div>Fig. 52.<br> <img src="/images/fig52.jpg" alt=""></div> <p>This instrument is a special construction to meet the requirements of navigation. It consists of a carefully constructed thermometer divided on its stem to degrees, which are sufficien... Mason&rsquos Hygrometer
<p><br> <strong>The Dry and Wet Bulb Hygrometer, or Psychrometer</strong>, known also as Mason’s hygrometer (fig. 79), consists of two parallel thermometers, as nearly identical as possible, mounted on a wooden bracket, one marked <em>dry</em>... Maxima And Minima Thermometers
<p><br> <strong>80. Rutherford’s</strong> arrangement for obtaining a complete instrument for the registration of heat and cold was simply mounting a maximum thermometer and a minimum thermometer upon the same frame or slab. Thus constructed, ... Maxima Thermometers
<p><br> <strong>70. Rutherford’s Maximum Thermometer.</strong>—The maximum thermometer, invented by Dr. John Rutherford, differs from an ordinary thermometer in having a small cylinder of steel, porcelain, or aluminium, moving freely in... Mcneild&rsquos Long Range Barometer
A barometer designed by a gentleman named McNeild is on a directly opposite principle to the one just described. The tube is made to float on the mercury in the cistern. It is filled with mercury, inverted in the usual manner, then allowed to float,... Measurement Of Heights By The Aneroid
For measuring heights not exceeding many hundred feet above the sea-level by means of the aneroid, the following simple method will suffice:—</p> <p>Divide the difference between the aneroid readings at the lower and upper stations by ·00...
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2 Construction Of Barometers Admiral Fitzroy&rsquos Scale Words Admiral Fitzroy&rsquos Words For The Scale Aneroids Admiral Fitzroy&rsquos Rain-gauge Vacuum Solar Radiation Thermometer Fortin&rsquos Barometer Chemical Weather Glass

Mountain Thermometer Sometimes Called Hypsometric Apparatus Thermometer Screen For Use At Sea Use Of The Barometer In Estimating The Height Of Tides Measurement Of Heights By The Aneroid King&rsquos Self-registering Barometer Pouillet&rsquos Pyrheliometer Self-compensating Standard Barometer Method Of Calculating Heights By The Barometer