The crucible, after having a luted cover applied, is to be put into a furnace, and exposed to a degree of heat regulated by the pyrometer of Wedgewood; which degree is proportional to the intended hardness of the pencils.
The advantages of the thermo-electric pyrometer are accuracy over a wide range of temperatures, continuity of readings, and the ease with which observations can be taken.
In the thermo-electric pyrometer of Le Chatelier, the wires used are platinum and a 10 per cent alloy of platinum and rhodium, enclosed in porcelain tubes to protect them from the oxidizing influence of the furnace gases.
If furnace radiation takes place in this manner, the indications of a pyrometer placed in a furnace are hard to interpret and such temperature measurements can be of little value.
A good, reliable pyrometer to estimate temperatures to (say) 2500° Fahr.
The end of the tube was then embedded in the coal, when the pyrometer indicated a temperature of 1260° Fahr.
In all experiments relating to temperature pretending to any degree of accuracy, a pyrometer of some kind should be used.
The leading principle on which the construction of this pyrometer has been based is the well-known law of the expansion of gases.
The method of graduating the indicator scales of the Frew pyrometer is worthy of special notice.
This is required for conveying the cold air to the pyrometer proper, for the piece of apparatus above described is simply an arrangement for securing a flow or current of air at constant pressure.
By this means it can be clearly demonstrated that, up to the highest point to which it is safe to use a mercurial thermometer, the readings of the pyrometer scale and that of the thermometer are identical.
Wedgwood; but his pyrometer gives, as is now demonstrated, very erroneous results.
The long tube that held the pyrometer was formed of the same metal.
He was watching for the first sight of the metal carrier, far more interested in what might be clinging to it than in the record of the pyrometer it held.
Accordingly, the heaters of the solar pyrometer did not reach maximum temperature, the highest indication by the thermometer of the small heater being 336.
Tremeschini's pyrometer is based on a different principle, viz.
The Ducomet pyrometer is on a very different principle, and only applicable to rough determinations.
In order to meet the objection that the diffusion of the rays in aphelion do not differ sufficiently, the solar pyrometer has been so arranged that the density, i.
Here thepyrometer itself consists of a set of tubes one inside the other, and all inclosed for safety in a large tube of fireclay.
The Trampler pyrometer is based upon the difference in the coefficients of dilatation for iron and graphite, that of the latter being about two-thirds that of the former.
This pyrometer is probably the most widely used at the present time.
It will be noted that the time was noted when the needle on the pyrometer passed each dial marking.
The boards shown to the right and the left swing into the room, which enables the attendant easily to change the numbers to conform to the pyrometer readings.
The best precision is obtained when an optical pyrometer is used each time under similar conditions of light and the same observer.
As soon as any variation from this is posted on the board outside the pyrometer room, the attendant sees it and adjusts the burners to compensate.
A pyrometerinstallation is very simple and any of the leading makers will furnish diagrams for the correct wiring and give detailed information as to the proper care of, and how best to use their particular instrument.
Pyrometer couples are more or less expensive, and should be cared far when in use.
Opposite each furnace number is a series of hooks whereon are hung metal numbers representing the pyrometer readings of the temperature in that particular furnace.
Where there are many in use, it is good practice to have a master pyrometer of a rare metal couple, which is used only for checking up the others.
Various methods of applying a pyrometer to common heat-treatment furnaces are shown in Figs.
For extremely high temperature, the optical pyrometer is largely used.
The water pyrometer is used as follows: Exactly one pint (0.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "pyrometer" in a variety of sentences. We hope that you will now be able to make sentences using this word.
