Mercurial Minima Thermometers Desirable
Alcohol does not expand equally for equal increments of heat, consequently errors are likely to exist in the scale indications unless the graduations are very accurately—not necessarily equally—made. On this account, as well as from t... Metallic Barometer
<p>This instrument, the invention of M. Bourdon, has a great resemblance to the aneroid, but is much simpler in arrangement. The inventor has applied the same principle to the construction of metallic steam-pressure gauges. We are here, however, only ... Method Of Calculating Heights By The Barometer
The pressure of the atmosphere being measured by the barometer, it is evident that as the instrument is carried up a high mountain or elevated in a balloon, the length of the column must decrease as the atmospheric pressure decreases, in consequenc... Method Of Calculating Heights From Observations With The Mountain Thermometer
Having considered how to make observations with the proper care and accuracy, it becomes necessary to know how to deduce the height by calculation. That a constant intimate relation exists between the boiling temperature of water and the pressure of... Method Of Verifying Marine And Other Barometers
“In nearly all the barometers which had been employed at sea till recently the index correction varied through the range of scale readings, in proportion to the difference of capacity between the cistern and the tube. To find the index correc... Methods Of Ascertaining The Exact Boiling Temperature
The normal boiling temperature of water all nations have tacitly agreed to fix under a normal barometric pressure of 29·922 inches of mercury, having the temperature of melting ice, in the latitude of 45°, and at the sea-level. If the atmosph... Milne&rsquos Self-registering Barometer
For a long time a good and accurate self-recording barometer was much desired. This want is now satisfactorily supplied, not by one, but by several descriptions of apparatus. The one first to be described was the design of Admiral Sir A. Milne, who h... Minima Thermometers
<p><br> <strong>73. Rutherford’s Alcohol Minimum Thermometer</strong>, fig. 55, consists of a glass tube, the bulb and part of the bore of which is filled with perfectly pure spirits of wine, in which moves freely a black glass index. A slight... Modification Of Milne&rsquos Barometer
The great difficulty to be overcome in Milne’s barometer, is to adjust the mechanism for obtaining registration so that the action of the striker upon the pointer should not in the slightest degree dot upon the paper. The same clock gives rot... Mountain Barometer On Fortin&rsquos Principle
This barometer, with Fortin’s cistern, as arranged by Messrs. Negretti and Zambra, is an elegant, manageable, and very accurate instrument for travelling purposes, and well adapted for careful measurement of heights. The cistern is made large... Mountain Thermometer Sometimes Called Hypsometric Apparatus
We have now to examine the construction of the boiling-point thermometer, and its necessary appendages, as adapted for the determination of heights.</p> <div>Fig. 72.<br> <img src="/images/fig72.jpg" alt=""></div> <div>Fig. 73.<br> <img src="... Nature Of Ozone
During the action of a powerful electric machine, and in the decomposition of water by the voltaic battery, a peculiar odour is perceptible, which is considered to arise from the generation of a substance to which the term ozone has been given, on a... Negretti &amp Zambra&rsquos Second Patent Mercurial Minimum Thermometer
In this thermometer a principle is used that has been long known to scientific men, viz. the affinity of mercury for platinum. If mercury be placed in contact with platinum under ordinary circumstances, no effect will take place; but if the mercury... Negretti And Zambra&rsquos Farmer&rsquos Barometer And Domestic Weather-glass
<p>It is a well-known fact that the barometer is as much, or even more affected by a change of wind as it is by rain; and the objection raised against a simple barometer reading, as leaving the observer in doubt whether to expect wind or rain, is remo... Negretti And Zambra&rsquos Patent Maximum Thermometer
consists of a glass tube containing mercury fitted on an engraved scale, as shown in fig. 54. The part of the thermometer tube above the mercury is entirely free from air; and at the point A in the bend above the bulb, is inserted and fixed with th...
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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