Journal of the Franklin InstitutePergamon Press, 1881 |
Im Buch
Ergebnisse 1-5 von 33
Seite xi
... Pieces and Lids , Bench Castings , Purifiers , Condensers , Scrub- bers , Exhausters , Governors , Patent Dry Centre Valves , By - Pass Valves , etc. ROTARY FANS . For Ventilation of Buildings and Mines . HYDRAULIC ELEVATORS . For ...
... Pieces and Lids , Bench Castings , Purifiers , Condensers , Scrub- bers , Exhausters , Governors , Patent Dry Centre Valves , By - Pass Valves , etc. ROTARY FANS . For Ventilation of Buildings and Mines . HYDRAULIC ELEVATORS . For ...
Seite 20
... pieces before it is worn down . The point I make is , that though the softer steel may have worn best under the lighter machinery of the past , it does not follow that it will wear best under the heavier machinery of the future . The ...
... pieces before it is worn down . The point I make is , that though the softer steel may have worn best under the lighter machinery of the past , it does not follow that it will wear best under the heavier machinery of the future . The ...
Seite 26
... pieces , or roll very badly in the blooming - mill . When the latter was introduced the steel - makers had only at their command recarburizers poor in manganese and high in phosphorus . Moreover , the American irons were then even much ...
... pieces , or roll very badly in the blooming - mill . When the latter was introduced the steel - makers had only at their command recarburizers poor in manganese and high in phosphorus . Moreover , the American irons were then even much ...
Seite 28
... pieces separately placed upon 10 - inch bearings under a 7 - gross ton hammer , a piece of 23 - inch round iron laid ... pieces were then turned over , the fuller placed upon the convex surface and the hammer allowed to fall from 13 ...
... pieces separately placed upon 10 - inch bearings under a 7 - gross ton hammer , a piece of 23 - inch round iron laid ... pieces were then turned over , the fuller placed upon the convex surface and the hammer allowed to fall from 13 ...
Seite 53
... pieces of timber at top and bottom . Columns over 8 feet long are apt to give give trouble from vibration . For a very large work , as tunnels , the column may be used to work out a drift of considerable size in extension of the line of ...
... pieces of timber at top and bottom . Columns over 8 feet long are apt to give give trouble from vibration . For a very large work , as tunnels , the column may be used to work out a drift of considerable size in extension of the line of ...
Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
1st cylinder ammonia applied battery boiler bromine carbon carbonic acid cent centre chemical chemists cinder circuit coil color condensing consumed per hour containing copper cubic degrees Fahrenheit diameter Dudley Dudley's dynamo-electric machines economic effect electric light electro-magnet electro-motive force electromotive force energy engine experiments Fahrenheit feet Franklin Institute furnace give gramme Gramme machine heat horses-power hydrochloric acid increased indigo lamp less machine MACHINERY magnetic manganese MANUFACTURERS means mechanical metal method mills motion nitric acid nov 80 ly obtained ordinary oxide paper Patent Pennsylvania Railroad Phila Philad'a Philadelphia phosphorus piston plate pounds per square practical present pressure produced Prof propiolic acid ratio resistance rolled rotation screw shaft silicon solution speed square inch STEAM PUMPS steel rails Street sulphur surface temperature tion tubes valve vapor velocity vis viva wearing capacity weight wire wrought iron
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...