182+.] 



Cure of Smoky Chimnies. 



389 



and we reduce all these difficulties of 

 atomic phenomena to the single princi- 

 ple of correlative action, or of equal 

 momentum in every equal space, i. e. 

 differently divided on two sides by 

 more motion and less matter, or less 

 motion and more matter, while tiie sud- 

 den or silent restoration creates all our 

 phenomena. 



Viewing' the whole giohe as in a spe- 

 cies of galvanic action, and the northern 

 hemisphere in one state, and the south- 

 ern in the contrary, we arrive at a com- 

 petent cause of a directive force; for 

 each hemisphere will present a prepon- 

 derating action to a pole in the contrary 

 state, and the opposite pole will seek the 

 parts towards the otiier hemisphere. 

 This preponderating action will neces- 

 sarily lead to (he dip of the pole most 

 acted U|)on, and the dip will depend on 

 (he energy of the suh-strata in pro- 

 ducing or conducting the atomic action 

 called galvanic. 



At the same time as the terrestrial 

 masses arc subject to a compound re- 

 action from tlie oblique direction of the 

 rotating and orbicular forces, the posi- 

 tion of the galvanic poles will not be in 

 the mundane poles, but in points deter- 

 mined by the angles of re-action, or 

 wilhin 23i degrees of either pole. 



Again, as these points are determined 

 by motions which do not exactly return 

 into themselves, so they will not be 

 fixed, but move in the same cycles as the 

 earth's own molions, of which motions 

 they are tlie mere results. Nor is it 

 difficult, on this principle, to compre- 

 hend the formation of the peculiar 

 rurvcs of magnetic variation ; for, as the 

 globular figure gives a peculiar direction 

 to every rhomb-line on the surface, so 

 the conlinnity of the rhomboidal points 

 will, on the surface, generate such 

 magnetic curves. The principle of ac- 

 tion being understood, and the chief 

 elements given, it would not be difficult 

 to reduce the whole to a rigid geometri- 

 cal analysis. 



At the .same time, it is not to be con- 

 cluded, that the energy developed by 

 (he juxtaposition of (he terrestrial 

 masses is exactly the same as that 

 educed from an ordinary galvanic 

 (rough. It is merely contended, that it 

 results from the same principle of ac- 

 tion, and probably bears the same rela- 

 tion to galvanism that galvanism bears 

 (o electricity. In some cases, its ac- 

 tion may be immediate; and, in others, 

 be what is called induced excitement, 



depending on the proximate materials ; 

 and hence local variations and diflPer- 

 ences of intensity. Light and heal, too, 

 would affect it ; and, in truth, I consider 

 the atoms which produce the pheno- 

 mena to be the same which, under dif- 

 ferent modes of action, produce light 

 and heat. All these phenomena arc 

 produced by the conflicts of atoms; and 

 all (he absurdities, of which we have for 

 ages been the dupes, have arisen from 

 causes being assigned to qualities and 

 appetites instead of matter in motion. 

 Banish the attractive and repulsive 

 powers, the fluids sui generis, and the 

 other inventions of ignorance, quackery, 

 and superstition j and in varied matter 

 and motion we shall easily detect all 

 the mysteries of nature, and find that 

 they are sublime, and worthy of their 

 Artizan, only because they are simple 

 and harmonious. 



R. Phillips. 

 Tavistock-Square. 



To the Editor of the Monthly Magazine. 

 SIR, 



1 OBSERVE, in Mr. Tredgold's 

 " Principles of Warming and Ven- 

 tilating Buildings," that he assumes an 

 excess of heat of 16° of Fahrenheit, as 

 ordinarily prevailing in a London house- 

 chimney, above the heat of the ambient 

 air, for effecting the ascent and dis- 

 charge of the smoke from the chimney 

 top. 



From the great care and accuracy 

 with which the author's data for calcu- 

 lating seem in general obtained, I pre- 

 sume he has sufficient grounds for this 

 assumption ; although, as fsir as I have 

 noticed, they are not stated. I much 

 wish, therefore, that some of your inge- 

 nious contributors, who may happen, 

 by means of a flat roof, to have ready 

 access to the tops of their chimneys, 

 would make and send to you the results 

 of a series of experiments, through the 

 various seasons, and at diflerent intervals 

 after the morning lighting of the fires, of 

 the actual heat in the tops of chimney- 

 pots, and of the ambient air at the same 

 times. 



I mention here, the heat in the top of 

 the chimney-pot, because this is the most 

 accessible point to which we can apply 

 a thermometer ; and also from an opi- 

 nion, that the heat here chiefly regulates 

 the discharge of the smoke, and nox- 

 iously carbonized gases of our domestic 

 fires. It has occnrre<l to me also, in 

 taking this view of the matter, that the 



use 



