Davis's Manual of Magnetism: Including Also Electro-magnetism, Magneto-electricity, and Thermo-electricity. With a Description of the Electrotype Process. For the Use of Students and Literary Institutions. With 100 Original IllustrationsDaniel Davis, jr., magnetical instrument maker, No. 11 Cornhill., 1842 - 217 стор. "The book contains a full description of the electrotype process, critical to many subsequent photomechanical patents and methods ... The electrotype process was important in photomechanical printing in that it was first used to copy daguerreotypes and was also used in experiments as a printing surface. Eventually Paul Pretsch used it with his photo-galvano-graphic process, and it was used continuously thereafter as a device to duplicate surfaces for printing in practically all the relief processes and some intaglio."--Hanson Collection catalog, p. 8 |
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Davis's Manual of Magnetism: Including Also Electro-magnetism, Magneto ... Daniel Davis Повний перегляд - 1842 |
Davis's Manual of Magnetism: Including Also Electro-magnetism, Magneto ... Daniel Davis Повний перегляд - 1842 |
Davis's Manual of Magnetism: Including Also Elctromagnetism, Magno ... Daniel Davis (jr.) Повний перегляд - 1842 |
Загальні терміни та фрази
acid antimony arch armature attracted bar magnet bar of iron battery current battery wires binding screw cups bismuth blue vitriol break the circuit breakpiece conductor connected Contact Breaker copper plate copper wire current flows current of electricity cylinder deflected deposit described dipping needle Double Helix earth electrical current electro-magnet electrotome electrotype excited extremities fixed flat spiral galvanic current galvanometer German silver heat horizontal influence instrument intensity iron bar iron wires junction length Leyden jar magnetic needle magnetic pole magneto-electric mercury metallic mould north pole obtained opposite direction Page's Revolving pair of plates pass placed polarity pole-changer produced quantity rasp repelled represented in fig reversed revolution ribbon spiral right angles ring rotate secondary current seen sewing needle shown side silver springs soft iron soldered solution south pole steel magnet surface thermo-electric tion tricity tube upper vibrate wheel wire coil zinc plate
Популярні уривки
Сторінка 97 - ... suppose to be laid down between London and Blackwall, the transmission of an electric current from a voltaic battery would cause the needle to change its position, so as to stand during the continuance of the current at right angles to the wire, being turned in one direction or the other according to the course of the current. If this deflexion of the needle were limited by two fixed stops placed respectively at the two sides of one of its poles, the motion of that pole to one stop might evidently...
Сторінка 132 - ... terminated by cups of mercury, are connected by a copper wire not more than a foot in length, no spark is perceived when the connection is either formed or broken ; but if a wire thirty or forty feet long be used instead of the short wire, though no spark will be perceptible when the connection is made, yet when it is broken by drawing one end of the wire from its cup of mercury, a vivid spark is produced.
Сторінка 71 - ... of this magnetic equator. , It is to be observed, that as that polarity, which is situated near the north pole of the earth, results from a current moving in a direction similar to that of the hands of a watch, it will have the properties of a southern polarity, in the sense in which we have invariably used the term ; that is, it will attract the north pole of a magnet, and repel the south pole ; while actions the reverse of this will take place in the southern hemisphere.
Сторінка 3 - The end which turns towards the north is called the north pole of the magnet, the other end its south pole.
Сторінка 70 - ... we should attend to the north pole in preference to the south ; and the movement with which we are most familiar, is that which we perform with our right hand, as in writing for instance, that is, from li'ft to right.
Сторінка 170 - ... any of the electromagnetic instruments in which motion is produced by the mutual action between a galvanic current and a steel magnet may be made to afford a magneto-electric current by producing the motion mechanically.
Сторінка 17 - Oxygen and hydrogen combine in the proportion of one volume of the former, to two of the latter, to form water.
Сторінка 43 - Polarity distin9uisher is a simple and practical test. It is constructed on the Oersted principle, that the magnetic needle tends to assume a position at right angles to the direction of the electric current. This small instrument shows the positive pole by the appearance of the red color in the fenestra as soon as the poles are held in contact with the instrument. 58. Non-conductors are chalk, fat, oil, rubber, dry gases, and a multiplicity of other substances. Success, therefore...
Сторінка 70 - First, it is more natural to fix our attention on the current of positive, than of negative electricity. Secondly, in a vertical wire, a descending current will occur to us more readily than an ascending one : or, if we imagine ourselves borne along by the current, it would be more natural to conceive ourselves moving with our feet foremost ; but if, on the contrary, we suppose ourselves to be at rest, we should conceive the current to be passing from our head to our feet. Our/осе would...
Сторінка 125 - ... namely, those connected with electricity of tension, and those belonging to electricity in motion. This distinction is taken at present not as philosophical, but merely as convenient. The effect of electricity of tension, at rest, is either attraction or repulsion at sensible distances. The effects of electricity in motion or electrical currents may be considered as 1st, evolution of heat; 2nd, magnetism; 3rd, chemical decomposition; 4th, physiological phenomena; 5th, spark.