The Scientific Papers of Sir Charles WheatstoneTaylor & Francis, 1879 - 380 Seiten |
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Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
angle aperture apparatus appear arithmetical progression axis battery binding-screws binocular binocular vision cause centre charge cipher circuit coating coil colours column of air conductor converse corresponding courant cylindrical deux diameter diatonic scale direction disc discharge distance earth effect electricity electro-magnet electro-motive force electrometer employed equal experiments figure film fixed galvanometer gutta-percha horizontal horopter inch inclination inductive instrument insulated interposed inverted Jew's harp length Leyden jar light magnetism magnitude means ment metal miles mirror modes of vibration motion mouvement needle nodal lines object observed obtained optic axes oscillations papier parallel perceived perpendicular perspective projections phenomena phonic placed plane of polarization plane of reflection poles position produced relief remains rendered resistance retina rheomotor rheostat rotation round seen semitone similar single sound sounding-board spark square stereoscope successive polarization surface telegraphic thickness tion tube tuning-fork velocity vertical vision voltaic vowel wire zinc
Beliebte Passagen
Seite 212 - On the Augmentation of the Power of a Magnet by the reaction thereon of Currents induced by the Magnet itself.
Seite 158 - An account of several new Instruments and Processes for determining the Constants of a Voltaic Circuit.
Seite 231 - ... the two perspective projections of the same solid object be so disposed, the mind will still perceive the object to be single, but instead of a representation on a plane surface, as each drawing appears to be when separately viewed by that eye which is directed towards it, the observer will perceive a figure of three dimensions, the exact counterpart of the object from which the drawings were made.
Seite 140 - In the electromagnetic clock, which was exhibited in action in the Apartments of the Society, all the parts employed in a clock for maintaining and regulating the power are entirely dispensed with. It consists simply of a face with its second, minute, and hour hands, and of a train of wheels which communicate motion from the arbor of the second's hand to that of the hour hand, in the same manner as in an ordinary clock train ; a small electro-magnet is caused to act upon a peculiarly constructed...
Seite 258 - ... of indistinctness in those parts of the field of view to which the eyes are not immediately directed, and which increases with the distance from that point, cannot be doubted, and it is also true that the objects thus obscurely seen are frequently doubled. In ordinary vision, it may be said, this indistinctness and duplicity is not attended to, because the eyes shifting continually from point to point, every part of the object is successively rendered distinct ; and the perception of the object...
Seite 260 - ... is seen at the intersection of the two lines of visible direction in which it is seen by each eye separately, whether these lines of visible direction terminate at corresponding points of the two retinae or not. But if we were to infer the converse of this, viz. that every point of an object in relief is seen by a single glance at the intersection of the lines of visible direction in which it is seen by each eye singly, we should be in error.
Seite 236 - ... side. A figure of three dimensions, as bold in relief as before, is perceived, but it has a different form from that which is seen when the drawings are in their proper places. There is a certain relation between the proper figure and this, which I shall call its converse figure. Those points which are nearest the observer in the proper figure are the most remote from him in the converse figure, and vice versa, so that the figure is, as it were, inverted ; but it is not an exact inversion, for...
Seite 277 - An account is then given of the construction and effects of an instrument for producing the conversion of the relief of any solid object to which it is directed. As this instrument conveys to the mind false perceptions of all external objects, the author calls it a Pseudoscope. It consists of two reflecting prisms, placed in a frame, with adjustments, so that, when applied to the eyes, each eye may separately see the reflected image of the projection which usually falls on that eye. This is not the...
Seite 113 - It form the extremities of the coils by which they are united to the circuit. On the upper face of each cylinder is a double brass spring moveable round a centre, so that its ends may rest at pleasure either on the ends of the thick...
Seite 215 - ... but immediately afterwards the glow disappeared, and only about one inch of the wire could be permanently kept at a red heat. This diminution of effect was accompanied by a great increase of the resistance of the machine. The cause of the momentary strong effect was, that the machine from its acquired momentum continued its motion for a few seconds, though it required a stronger force than could be applied to maintain that motion. Each time the circuit is broken and recompleted the same effect...