Van Rysselberghe, but the later, put forward in 1867, included metallic thermometers and was less successful.
If the plate is thin, it is necessary to measure the thickness with great care, and it is necessary to assume that the temperatures of the surfaces are the same as those of the media with which they are in contact, since there is no room to insert thermometers in the plate itself.
The actual tempera ture of the metal itself can then be observed by inserting thermometers or thermo-couples at measured distances from the centre.
C. Mitchell, under Tait's direction, repeated the experiments with the same bar nickel-plated, correcting the thermometers for stem-exposure, and also varying the conditions by cooling one end, so as to obtain a steeper gradient.
They are also partly caused by the large uncertainties of the corrections, especially those of the mercury thermometers under the peculiar conditions of the experiment.
The gradient near the entrance to the calorimeter was deduced from observations with five thermometers at suitable intervals along the bar.
3 were obtained from the readings of a number of platinum thermometers buried in undisturbed soil in horizontal positions at M`Gill College, Montreal.
An additional difficulty arises in the case of observations made with long mercury thermometers buried in vertical holes, that the correction for the expansion of the liquid in the long stems is uncertain, and that the holes may serve as channels for percolation, and thus lead to exceptionally high values.
Is best avoided by employing platinum thermometers buried horizontally.
The amplitudes and phases of the temperature waves at different points are observed by taking readings of the thermometers at regular intervals.
In using mercury thermometers, it is best, as in the apparatus figured, to work on a large scale (4-in.
No allowance was made for the variation of density with temperature, or for the variation of the distance between the thermometers, owing to the expansion of the bar.
Flows through the spiral coolers N and M, and finally through the box H, where it is well mixed before passing the outflow thermometer P. As soon as a steady state is reached, the difference of temperature between the outflow and inflow thermometers, multiplied by the current of water in grammes per minute gives the heat per minute supplied by combustion.
His thermometers were subsequently corrected to the Paris scale by A.
000 Per 1° C. His Thermometers Were Compared With A Mercury Thermometer Standardized In Paris, And With A Platinum Thermometer Standardized By Griffiths.
In Spite Of The Large Corrections The Results Were Extremely Consistent, And The Value Of The Temperature Coefficient Of The Diminution Of The Specific Heat Of Water, Deduced From The Observed Variation In The Rate Of Rise At Different Points Of The Range 15° To 25°, Agreed With The Value Subsequently Deduced From Rowland'S Experiments Over The Same Range, When His Thermometers Were Reduced To The Same Scale.
9, Is Heated By A Steady Electric Current During Its Passage Through The Tube, And The Difference Of Temperature Do Between The Inflowing And The Outflowing Liquid Is Measured By A Single Reading With A Delicate Pair Of Differential Platinum Thermometers At A And B.
Stirring Is Effected By Causing The Water To Circulate Spirally Round The Bulbs Of The Thermometers And The Heating Conductor As Indicated In The Figure.
Pernet, Extended From O° To 100° C., And Appears To Have Attained As High A Degree Of Excellence As It Is Possible To Reach By The Employment Of Mercury Thermometers In Conjunction With The Method Of Mixture.
The original intention was to push the experiments to a pressure equivalent to thirty atmospheres, but owing to the signs of failure exhibited by the boiler the limit actually reached was twenty-four atmospheres, at which pressure the thermometers indicated a temperature of about 224 0 C. In his last paper, published posthumously in 1838, Dulong gave an account of experiments made to determine the heat disengaged in the combination of various simple and compound bodies, together with a description of the calorimeter he employed.
Trans., 1776) contains remarks on the precautions necessary in making and using thermometers, a subject which is continued in the following year in a report signed by him and six others.
Observations for temperature have been taken for many years at the stations of the Indo-European Telegraph and for a few years at the British consulate in Meshed, and the monthly and annual means shown in the following table have been derived from the indications of maximum and minimum thermometers in degrees Fahrenheit.
Along the shores of the Caspian, particularly in Gilan and Mazandaran, and of the Persian Gulf from the mouth of the Shatt el Arab down to Bander Abbasi, the air during a great part of the year contains much moisturedry- and wet-bulb thermometers at times indicating the same temperatureand at nights there are heavy falls of dew.
He was the author of important improvements in the construction of thermometers, and he introduced the thermometric scale known by his name and still extensively used in Great Britain and the United States (see Thermometry).
Among Amesbury's manufactures are hats, cotton goods, carriages, automobile bodies, carriage and automobile lamps, thermometers, brass castings and 'motor boats.
Calculating the actual, societal costs of fatty foods, alcohol, cars, pet ownership, mercury thermometers, air conditioning, solar panels, razor blades, jogging shoes, and ten thousand other things, and incorporating those costs in the prices as taxes would lead to a vastly more efficient allocation of resources.