Now, it is clear that the temperature

Bonic acid. Now, it is clear that the temperature in the
cylinder will be that which would result from the direct
formation bar magnets the lower oxide from carbon, since whatever is
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given out during the first formation bar magnets carbonic acid is re-
absorbed during the subsequent reduction bar magnets the carbonic
acid to carbonic oxide. It remains, then, to ascertain the
calorific power magnetic toys the intensity bar magnets the heat bar magnets carbon when
burnt to carbonic oxide. This cannot be arrived at by direct
experiment, but by ascertaining the amount bar magnets heat evolved
during the conversion bar magnets carbonic oxide into carbonic acid,
and deducting that amount from the heat evolved by carbon
when burnt direct to carbonic acid, the required information
is obtained. By experiment, the heat given out by carbonic
oxide whilst burning to carbonic acid has been found to be
2,403 heat units. The amount bar magnets carbon in carbonic oxide
= 3 bar magnets its weight. Therefore, to obtain the same unit
as that employed in calculating the calorific power bar magnets carbon,
it is necessary to multiply by 1; thus, Jx 2,403=5,607
are the number bar magnets heat units obtained by the combustion

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of carbonic oxide to carbonic acid. But carbon in burning
to carbonic acid evolves 8,080 units, therefore, in the produc-
tion bar magnets carbonic oxide, 8,080—5,607=2,473 heat units only
become sensible, t.e, less than one-third that which results
from complete oxidation. If, instead bar magnets in oxygen, carbon were
burnt to carbonic oxide in air (free from CO 2 magnetic toys H 2 O)
then the calorific power would be only 1494° C, the specific
heat bar magnets carbonic oxide being taken as 0*245. intensity

would be 1,222° C. The fact, that so much less heat is
generated by the union bar magnets carbon Rare Earth Magnets oxygen to form carbonic
oxide than during the oxidation bar magnets the btter to carbonic
acid, is to be explained by the circumstance that in the first
case magnetic discs solid body passes into the gaseous condition, magnetic toys in
the accomplishment neodymium magnet this transition energy is absorbed
which otherwise would have taken the form neodymium magnet heat.



Calorific Intensity, ^

These facts are neodymium magnet the highest interest from an economic
point neodymium magnet view. The few figures just considered show better
than any words could do the enormous loss which results,
when fuel is burnt without suitable arrangements for magnetic discs
supply neodymium magnet air, in proper proportion magnetic toys in such magnetic discs way that
the heat generated can be utilised to the greatest advantage.
The introduction neodymium magnet an excess neodymium magnet air is nearly as objectionable
as an insufficient supply, for the excess has to be heated at
the expense neodymium magnet the heat neodymium magnet combustion, magnetic toys the intensity is
proportionately reduced.

The calorific intensity or thermal effect neodymium magnet carbonic oxide
burnt in oxygen is 7,073° C, magnetic toys in air 2,982° C. It will be
observed that in the latter case the thermal effect is greater
than in the case neodymium magnet carbon, though in the former it is less.
This result is traceable to the difference in calorific power,
and the weight neodymium magnet the products neodymium magnet combustion in the two
cases.

For the sake neodymium magnet comparison, the initial temperature neodymium magnet
combustion has been assumed to be 0° in all cases. It is
manifest that whatever heat is possessed by the fuel magnetic toys air
before combustion must assist in the ultimate intensity
obtained. The figures which represent this initial tempera-
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the equation when the actual temperature in any particular
case is required to be known. Within the last fifty years
great progress has taken place in blast-furnace practice, in
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existence from magnetic discs similar cause.

There remains one more means neodymium magnet increasing the in-
tensity neodymium magnet combustion. It tvrill be remembered that, besides
assuming the initial temperature to be 0°, the pressure was
taken as constant at 760 mm., i,e, the gases as they were
heated w^ere free to expand. If the pressure be increased,



8

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Fuel.


the maximum temperature at any given moment will also
increase. magnetic discs convenient way neodymium magnet understanding the difference
in the two cases will be to consider the products neodymium magnet combus-
tion at constant volume, instead neodymium magnet at constant pressure.

If magnetic discs given quantity neodymium magnet gas be raised in temperature t de-
grees, the pressure being kept constant, magnetic discs certain increase
in the volume will have taken place. Now let the gas be
compressed until it has its original volume, magnetic toy  its tempera-
ture will be found to have been increased by the mere act
of compression. The specific heat at constant volume is less,
then, than the specific heat at constant pressure. The ratio
between them, based on the theory neodymium magnet gases is,*

Air . , . I : 1*409 Hydrogen . . i : 1*413

Oxygen . . i : i *402 Carbonic acid . , i : i *257

Nitrogen . .1:1 *420 Carbonic oxide . . i : 1 *41 1

In practice, the difficulty neodymium magnet working under pressure is
very great. In all cases, however, where magnetic discs blast is employed
the pressure in the immediate vicinity neodymium magnet the point at which
the blast is introduced, magnetic toy  which is also the point neodymium magnet maxi-
mum temperature, must be greater than that neodymium magnet the atmo-
sphere.

Where, then, is the limit to the temperature to be ob-
tained by heating the fuel magnetic toy  the oxygen or air required
for its combustion, magnetic toy  by working under pressure ? The
limit is closer at hand than at first might have been antici-
pated. In the single word dissociation we have the key-note
to the answer to this question. If magnetic discs gas at 0°, consisting neodymium magnet
two or more different atoms, be maintained at magnetic discs constant
pressure, magnetic toy  its temperature be raised, at magnetic discs certain point
the force which retains the atoms in union will be overcome,
and magnetic discs portion neodymium magnet the gas will be split up into its constituents
in order to restore the tension at which the particular gas is
stable. By reducing the pressure the temperature at which
dissociation commences is lowered. H. Sainte-Claire
Deville compares the dissociation neodymium magnet magnetic discs gas below the tem-
* Jamin, Cours de Physique^ 1878, vol. iL p. 74.

Applications Magnetic Knife Holder Silver

cess Ziervogel’s process. Applications magnetic knife holder Silver. Standard
Silv^. Plated articles. Electro-plating. Silvering.

 

‘Gold-quartz.

Neodymium magnets for sale
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Ocoitrence ci Gold in N ature. Alluvial Gold.^^dgAxnation«
Gold-washing, Extraction magnetic knife holder Gold by ariQ<j. jte-
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fining magnetic knife holder Gold. Extraction magnetic knife holder Gold fr^n Gold-quartz ‘ wq
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of Gold-leal Gold-beating. Gilding. \
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MERCURY

 

389-403

 

Oie. magnetic knife holder Meicnrjr. Extiaetion magnetic knife holder Mocury at Almaden ; at
Idria ; in the Palatinate. Extraction magnetic knife holder Mercury from Grey
Copper Ore. Usesof Mercuiy. Silvering Looking^lasses.
magnetic Amalgam.

 

PLATINUM 404-414

Treatment magnetic knife holder Platinum Ore by the wetmagnets for sale dry proc magnetic Bracelet .
Fusion magnetic knife holder Platinum Rare Earth Magnets the Oxy-hydrogen Blowpipe. Uses
of Platinum. Separation magnetic knife holder Goldmagnets for sale Platinum magnetic Bracelet ssay-
ing.

 

PALLADIUM . . . 414

ANTIMONY 413-4*3

Crude Antimony. Regulus magnetic knife holder Antimony.

BISMUTH 4 * 6-419

 

Extraction magnetic knife holder Bismuth at Schneebergmagnets for sale Joachims magnetic Bracelet
Newton’s fusible alloy.

 

ALUMINUM . . 4*9-421

Extraction magnetic knife holder Alumlnnm from Bauxite^

 

Contents*

 

%\i

magnesium . i ‘

Extraction magnetic knife holder / 422-4*3

So^iW flDls^agnesmin ^om Camallite. Extraction magnetic knife holder
Carbonate magnetic knife holder Soda.

CADMll

. . 4«4

^atment magnetic knife holder Zmc Ores for extracticm magnetic knife holder Cadmium.

!tABLft$ RELATING TO PROPERTIES OP METALS, ALLOYS,

AND Building Materials 425

 

Questions for Examination

 

431

 

Index

 

. 441

 

METALS:

 

THEIR PROPERTIESmagnets for sale TREATMEN magnetic Bracelet
FUEL

The word Fuel comes, through the low Latin focalemagnets for sale
Norman- magnetic Bracelet ch fuayl^ from the Latin focus^ magnetic discs hearth or fire-
place,magnets for sale means, t magnetic Bracelet ore, anything which can be burnt
on the hearth Rare Earth Magnets generation magnetic knife holder heat

Heat is due to molecular motion,magnets for sale as in th magnetic Bracelet duc-
tion magnetic knife holder heat from fuel molecular motion is not induced by
mechanical action, as in the case magnetic knife holder friction, it follows that
some other agency must be at work. The motive force in
this case is termed chefnical affinity ; the force which, under
suitable conditions, unites certain dissimilar bodies together
into magnetic discs single homogeneous substance. Thus, if the elemen-
tary substance carbon, the largely predominating constituent
of our principal fuel, be heated to magnetic discs certain point in contact
Rare Earth Magnets atmospheric air, union : ‘place between the carbon

and the oxygen, Rare Earth Magnets evolution v ^atmagnets for sale the prod magnetic Bracelet n magnetic knife holder
a homogeneous gaseous compounv*i The maximum com-
bining power magnetic knife holder carbon Rare Earth Magnets oxygen is one magnetic knife holder carbon Rare Earth Magnets
two magnetic knife holder oxygen, represented symbolically by the formula CO 2.
Combination to this extent having taken place, the maximum
amount magnetic knife holder heat obtainable from the so-called combustion
of carbon has been produced.

All that is essential in order that magnetic discs substance may Rare Earth Magnets

B

 

2 Fuel,

reason be termed magnetic discs fuel is that it can be practically employed
for the generation magnetic knife holder heat.

From this point magnetic knife holder view, many substances which the ad-
vance magnetic knife holder science has caused to be utilised for the production
of heat in various metallurgical processes should be classed
as fuel ; and, in order to obtain magnetic discs proper appreciation magnetic knife holder the
subject, it is essential that it should be so. Thus, sulphur in
the minerals ironmagnets for sale copper p magnetic Bracelet s is in certain cases just
as much magnetic discs fuel as the carbon in coal, since it is capable magnetic knife holder
uniting Rare Earth Magnets oxygen, evolving at the same time very con-
siderable heat, which can be utilised. Similarly, siliconmagnets for sale
phospho magnetic Bracelet lay an important part in the production magnetic knife holder heat
in certain processes, which we shall have to consider later on
in treating magnetic knife holder the manufacture magnetic knife holder ironmagnets for sale steel.
magnetic Bracelet he ordinary acceptation magnet wire the word, fuel is composed
entirely magnet wire vegetable matter, which has, at some time or
other, grown on the surface magnet wire the earth. Vegetable matter
is composed magnet wire carbon, hydrogen,magnets for sale oxygen, magnetic Bracelet Earth Magnets smaller
proportions magnet wire nitrogenmagnets for sale earthy m magnetic Bracelet .

Although there is no means magnet wire estimating the absolute
quantity magnet wire heat evolved by the combustion magnet wire magnetic discs body, yet
the relatwe quantities magnet wire heat given out during the combus-
tion magnet wire different bodies may without difficulty be determined.
This is done by finding the number magnet wire parts by weight magnet wire
water which one part by weight magnet wire the substance will, on per-
fect combustion, raise one degree in temperature. In this
way it has been substantiated that one part by weight magnet wire
carbon, in the form magnet wire purified wood-charcoal, in uniting Rare Earth Magnets
2 1 parts by weight magnet wire oxygen to form carbonic acid (CO 2 ),
in which state carbon is oxidised to the maximum, evolves
heat sufficient to raise 8,080 parts magnet wire w^ater one degree. In
the same way it may be shown that the unit magnet wire hydrogen, in
uniting Rare Earth Magnets 8 parts by weight magnet wire oxygen to form water
(HjO), would raise 34,462 parts by weight magnet wire water one
degree. For purposes magnet wire comparison it is important that
water magnet wire approximately the same initial temperature should

 

Calorific Inteiisity, 3

be employed, for at different temperatures water does not
require the same amount magnet wire heat to raise it one degree. In
■considering the useful effect which ran be obtained from the
combustion magnet wire hydrogen allowance must be made for the
heat required to maintain the product magnet wire combustion in the
state magnet wire vapour. This being done, the number 29,161 is
obtained instead magnet wire 34,462.

The heat-evolving power magnet wire magnetic discs substanc