Journal of the Franklin InstitutePergamon Press, 1849 Vols. 1-69 include more or less complete patent reports of the U. S. Patent Office for years 1825-59. Cf. Index to v. 1-120 of the Journal, p. [415] |
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Page 14
... distances from cen- tre to centre : 3 1 ° of 5 metres apart , ( a ' ) 0.000953 H4 +0.029296 H3 +0.40833 H2 + 1.456 H ... distance between the axes of these counterforts . If we should now likewise seek the moment of a vertical wall of ...
... distances from cen- tre to centre : 3 1 ° of 5 metres apart , ( a ' ) 0.000953 H4 +0.029296 H3 +0.40833 H2 + 1.456 H ... distance between the axes of these counterforts . If we should now likewise seek the moment of a vertical wall of ...
Page 26
... distance from the points of support . Mr. Vignoles stated that he had , from the first , decidedly set his face against this form of rail , and argued for and introduced rails with the same section throughout their length - since ...
... distance from the points of support . Mr. Vignoles stated that he had , from the first , decidedly set his face against this form of rail , and argued for and introduced rails with the same section throughout their length - since ...
Page 30
... distance sufficient for his personal safety . In all his ex- perimental mines , which were fired singly , and independent of each other , Mr. Wright found that the rule deduced by Sir John Burgoyne with great care and skill from ...
... distance sufficient for his personal safety . In all his ex- perimental mines , which were fired singly , and independent of each other , Mr. Wright found that the rule deduced by Sir John Burgoyne with great care and skill from ...
Page 31
... superfluous here to explain , that , in speaking of conjunct mines , the term " two - lined intervals " implies that the central distance between adjacent charges is twice the line of least resistance of Explosion of Dover Cliff . 31.
... superfluous here to explain , that , in speaking of conjunct mines , the term " two - lined intervals " implies that the central distance between adjacent charges is twice the line of least resistance of Explosion of Dover Cliff . 31.
Page 32
... distance from the charge to the nearest surface of the rock , or mass , that is to be removed by the explosion . The whole of the arrangements for firing these great charges by the voltaic battery , were made by Lieutenant Hutchinson ...
... distance from the charge to the nearest surface of the rock , or mass , that is to be removed by the explosion . The whole of the arrangements for firing these great charges by the voltaic battery , were made by Lieutenant Hutchinson ...
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acid alloy antiseptic applied arches average axles blocks boiler borax carbonic acid carriages cast cast-iron cemetery cent certif Cloudy coffin color committee considerable construction copper core cost counterforts cubic curves cylinder deposited depth diameter distance edge rail effect employed engines equal exhibition expense experiments feet force Franklin Institute friction glass grave heat inches increase iron J. C. LOUDON judges laid lift load machine ments Merrick & Towne metal metres mile minute mode motion moulding Mtrs nearly North Union Railway observed obtained oxide passengers patent pattern pavements paving pebble Philadelphia piece plate produced proportion quantity rail railway resistance road sand shaft side silver sluice-gate specimens spectrum square steam street sufficient sulphuric acid surface talc thickness timber tion tons tramways turbine upper Vauban velocity vertical vessel Vignoles waste-board weight wheel wood yard zinc
Popular passages
Page 131 - ... an outer cylinder of glass, closed at the top by a plate of mica, g ; or, still better, by two plates of mica, one resting on the top of the glass, and the other one, h, dropping a short way into it.
Page 285 - I conceive, right to add, that in all cases, even though the composition of the water seems to bring it within the conditions of safety now stated, an attentive examination should be made of the water after it has been running for a few days through the pipes ; for it is not improbable that other circumstances, besides those hitherto ascertained, may regulate the preventive influence of the neutral salts.
Page 145 - 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.
Page 355 - ... by sixteen iron screws four and a half inches in diameter. This platform has several shores on its surface, which were brought to bear equally on the vessel's bottom, to prevent her from canting over on being raised out of the water. About thirty men...
Page 126 - There existed large quantities of haematite in Great Britain, equal in quality to that of Nassau, or of the Hartz mountains, from which so much iron was made, for converting into steel. The mines of Ulverstone alone now produce 50,000 tons annually, and at least 25,000 tons more could be shipped from Cornwall ; and if a demand existed, there was scarcely a limit to the quantity that could be raised. He apprehended that the iron made by this process could be converted into good steel : this was very...
Page 335 - ... received, in order to give the work a good appearance. In order to test this, Mr. Nasmyth subjected two pieces of cable bolt iron to 160 blows between swages, and afterwards annealed one of the pieces for a few hours. The unannealed piece broke with five or six blows of a hammer, showing a crystallized fracture ; while the annealed piece was bent double under a great number of blows, and exhibited a fine fibrous texture. The fact of the fibre being restored by annealing was well understood and...
Page 331 - From the black powder obtained as above, the palladium is extracted by resolution in nitric acid and super-saturation with ammonia, by which the oxides of palladium and copper are first precipitated, and then redissolved, while those of iron, lead, &c., remain insoluble. To the clear ammoniacal solution, muriatic acid is then added in excess, which occasions a copious precipitation of the yellow ammonio-chloride of palladium, from which, after sufficiently washing it with cold water and ignition,...
Page 114 - So on copper coated with mercury, the mercury in such case no doubt readily tarnishing (see section 7, polished surfaces not receiving spectra). Having decided that the effect in question is due neither to light nor heat, to what cause, it may be asked, is it to be ascribed ? Conclusions. — Istly, As brightness of the plate is indispensable, and with brightness must exist an increased tendency to tarnish, or enter into chemical combination ; 2ndly, as the plate must be of an oxidable metal, and...
Page 115 - As the more perfectly the coins are cleaned and dried,* the less the effect, and as a dry perspiration (so to call it) must exist in a greater or less degree on all coins, since they pass through so many hands, and as perspiration is slightly acid. 4thly. As even with clean coins the effectt by actual contact must be admitted, but still is greater when there is a difference in the naturej of the metal ; and Sthly.
Page 206 - Mechanical flight seems more adapted for use on a much smaller scale, and for less remote distances; serving, perhaps, the same purpose that a boat does to a ship, each being essential to the other.