Journal of the Franklin InstitutePergamon Press, 1881 |
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Seite 14
... fact is worthy of consideration in connection with the low- grade ores which so generally abound . Throughout the coal measures this class of ores are found , closely interstratified with the fuel , and by reason of this proximity ...
... fact is worthy of consideration in connection with the low- grade ores which so generally abound . Throughout the coal measures this class of ores are found , closely interstratified with the fuel , and by reason of this proximity ...
Seite 15
variety of ores in Cambria , Huntingdon and , in fact , throughout the entire bituminous coal fields . Many of these ores contain more than ten per cent . of earthy matter , but rarely exceed 30 per cent . , which has been referred to ...
variety of ores in Cambria , Huntingdon and , in fact , throughout the entire bituminous coal fields . Many of these ores contain more than ten per cent . of earthy matter , but rarely exceed 30 per cent . , which has been referred to ...
Seite 26
... fact , such a one will be better for both the producer and consumer than the compromise which Dr. Dudley recommends ... facts present them- selves , and with steel containing 0-10 phosphorus , and not more than 0:35 manganese , the ...
... fact , such a one will be better for both the producer and consumer than the compromise which Dr. Dudley recommends ... facts present them- selves , and with steel containing 0-10 phosphorus , and not more than 0:35 manganese , the ...
Seite 29
... fact fatal , to the good quality of this product , and the greatest care was exercised to procure materials in which this ele- ment could not be more than traced . With the development of this art it has been found that larger and ...
... fact fatal , to the good quality of this product , and the greatest care was exercised to procure materials in which this ele- ment could not be more than traced . With the development of this art it has been found that larger and ...
Seite 31
... fact , it is difficult to conceive how any other form of test can produce more uniform effects or which can be more accurately measured ; the results may be more diverse with such a test than with others , because they are produced by ...
... fact , it is difficult to conceive how any other form of test can produce more uniform effects or which can be more accurately measured ; the results may be more diverse with such a test than with others , because they are produced by ...
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Beliebte Passagen
Seite 295 - From that time, like everything else which falls into the hands of the Mussulman, it has been going to ruin, and the discovery of the passage to India by the Cape of Good Hope gave the deathblow to its commercial greatness.
Seite 240 - THE BOYDEN PREMIUM URIAH A. BOYDEN, ESQ., of Boston, Mass., has deposited with THE FRANKLIN INSTITUTE the sum of one thousand dollars, to be awarded as a premium to "Any resident of North America who shall determine by experiment whether all rays of light,* and other physical rays, are or are not transmitted with the same velocity.
Seite 383 - ... economically on a large scale for many important practical applications the old thermo-dynamics of Joule in electro-magnetism ; and, what particularly concerns us now in connection with my present subject, they make it possible to transmit electro-magnetically the work of waterfalls through long, insulated conducting wires, and use it at distances of fifties or hundreds of miles from the source, with excellent economy — better economy, indeed, in respect to proportion of energy used to energy...
Seite 80 - Book has now been some years before the public without addition or revision, there are many subjects of importance which, of necessity, are either not included in its pages, or have been treated somewhat less fully than their present importance demands. With the object, therefore, of remedying these omissions, this Supplement is now being issued.
Seite 440 - The Committee on Science and the Arts constituted by the Franklin Institute of the State of Pennsylvania, for the promotion of the Mechanic Arts, to whom was referred for examination a Solar Compass, invented by WM.
Seite 295 - Baeyer, the worthy successor of the illustrious Liebig in the University of Munich. Here then we have another proof of the fact that the study of the most intricate problems of organic chemistry, and those which appear to many to be furthest removed from any practical application, are in reality capable of yielding results having an absolute value measured by hundreds of thousands of pounds.
Seite 305 - ... process exists in which indigo can be used in combination with other colours in the ordinary way, or without requiring some special mode of fixing after printing. Hence it is clear that the weak points of natural indigo lie in the absence of any good process for utilising the whole of its colouring matter, and in the impossibility, or at any rate, great difficulty of employing it in the ordinary madder styles of calico printing. Such were the reasons which induced the patentees to believe that...
Seite 285 - But an agent which is conducted along metallic wires in the manner described ; which, whilst so passing possesses the peculiar magnetic actions and force of a current of electricity ; which can agitate and convulse the limbs of a frog ; and which, finally, can produce a spark* by its discharge through charcoal (32.), can only be electricity.
Seite 377 - ... available without the influence of any external body — or meteoric — that is, belonging to bodies deposited on the earth from external space. Terrestrial sources, including mountain quarries and mines, the heat of hot springs, and the combustion of native sulphur, perhaps also the combustion of inorganic native combustibles, are actually used ; but the mechanical effect obtained from them is very inconsiderable, compared with that which is obtained from sources belonging to the two classes...
Seite 68 - Europe by Mr. Preece may, therefore, be reconciled with the positive results obtained in America by Mr. Tainter and myself. A still more curious demonstration of localization of vibration occurred in the case of a large metallic mass. An intermittent beam of sunlight was focussed upon a brass weight (1 kilogram,) and the surface of the weight was then explored with the microphone shown in Fig. 2. A feeble but distinct sound was heard upon touching the surface within the illuminated area, and for...