Study on Manual Tin Welding Technology of Platinum Wire-Copper Wire

IV. On a magneto-electric machine

Proceedings of the Royal Society of London ◽

10.1098/rspl.1866.0091 ◽

1867 ◽

Vol 15 ◽

pp. 404-405

Keyword(s):

Copper Wire ◽

Electric Machine ◽

The Other ◽

Platinum Wire ◽

External Work ◽

Small Machine

In June 1864 I received from Mr. Wilde a small magneto-electric machine, consisting of a Siemens’s armature and six magnets. This I endeavoured to improve upon, my object being to get a cheap machine for blasting with Abel's fusees. This was done by making one of circular magnets, and a Siemens's armature revolving directly between the poles, the armature forming the circles; with this I could send a very considerable power into an electro-magnet, &c. It was then suggested to me by my assistant, that if the armature had two wires instead of one, the current from one being sent through a wire surrounding the magnets, their power would be augmented, and a considerable current might be obtained from the other wire available for external work; or there might be two armatures, one to exalt the power of the magnets, and the other made available for blasting other purposes. Want of time prevented me carrying this out until now; but since the interesting papers of C. W. Siemens, F. R. S., and Proissor Wheatstone, F. R. S., were read last month, I have carried out the idea as follows:— Two bars of soft iron, measuring 7½in. x 2½ in. x ½in., are each wound, round the centre portions, with about thirty yards of No. 10 copper wire; and shoes of soft iron are so attached at each end, that when the bars are placed one above the other there will be a space left between the opposite shoes in which a Siemens’s armature can rotate: on each of the armatures is wound about ten yards of No. 14 copper wire cotton covered. The current generated in one of the armatures is always in connexion with the electro-magnets; and the current from the second armature, being perfectly free, can be used for any purpose for which it may be required. The machine is altogether rudely constructed, and is only intended to illustrate the principle; but with this small machine three inches platinum wire ·01 can be made incandescent.

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On the increase in resistance to the passage of an electric current produced on certain wires by stretching

Proceedings of the Royal Society of London ◽

10.1098/rspl.1877.0061 ◽

1878 ◽

Vol 26 (179-184) ◽

pp. 401-410

Keyword(s):

Electric Current ◽

Copper Wire ◽

Lower Extremities ◽

The Other ◽

Platinum Wire ◽

Sliding Scale ◽

The Mean ◽

The Wire ◽

Two Sides ◽

Permanent Increase

The object of this inquiry was (1) to determine the relation between increased resistance to the passage of an electric current and stretching-force; (2) to ascertain how much of the increased resistance in each case is produced by mere increase of length and diminution of section. In order to determine the increase of resistance from stretching, the wires were each divided into two parts about 14 feet or more in length. One end of each part was fastened to a stout hook, firmly fixed into a block of wood, the two hooks used being about 8 inches apart, and the block of wood in which they were fixed securely fastened across two strong uprights, which were placed resting against the wall, so that the weights attached to the wires might swing clear of the table on which the uprights were placed. A loop was made at the other end of each part of the wire, and to this the weights were attached by means of strong hooks. The two parts of the wire were joined at the top, about 2 inches below each hook, by a piece of copper wire, which was securely soldered on to each part of the wire, so as to connect them; and toward the lower extremities of the two parts, about 5 inches above the points of attachment of the weights, two copper wires were soldered so as to connect the wires with a Wheatstone’s bridge. The increase of resistance of the wires was measured by means of a sliding scale of platinum wire divided into millimetre divisions, each equal to ·00166 ohm. As the object was to obtain the temporary and not the permanent increase of resistance (which permanent increase was found more or less with al the wires), weights slightly heavier than those intended to be used were first put on and taken off. Afterwards the wire was balanced as nearly as possible by German-silver wire, without the sliding scale, and then very exactly with the sliding scale, which was connected with one of two resistance-coils of 100 ohms each, which formed the other two sides of the bridge. The weights used were then carefully put on to the wires and the increase of resistance measured by means of the sliding scale the weights were next taken off again, and the sliding scale used for balancing once more. If there was any slight difference, as sometimes occurred, between the readings of the sliding scale before the weights were put on and after they were taken off, the mean of the two readings was taken.

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III. On the attractions of magnets and electric conductors

Proceedings of the Royal Society of London ◽

10.1098/rspl.1873.0037 ◽

1874 ◽

Vol 22 (148-155) ◽

pp. 245-247

Keyword(s):

Copper Wire ◽

Platinum Wire ◽

Electric Currents ◽

Thin Platinum

Being desirous of ascertaining whether, in the case of two parallel wires conveying electric currents, the attractions and repulsions were between the currents themselves or the substances conveying them, and believing this question had not been previously settled, I made the following experiment:— I passed a powerful voltaic current through the thick copper wire of a large electromagnet, and then divided it equally between two vertical pieces of thin platinum wire of equal diameter and length (about six or seven centimetres), so as to make them equally white-hot, the two wires being attached to two horizontal cross wires of copper.

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Scanning and Transmission Electron Microscopy of Endomentrium in Women Wearing TCu-380-A IUD 's

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100080754 ◽

1977 ◽

Vol 35 ◽

pp. 666-667

Author(s):

A. Gonzalez Angulo ◽

R. Berlioz ◽

R. Aznar

Keyword(s):

Copper Wire ◽

Uterine Cavity ◽

Morphological Evidence ◽

Secretory Phase ◽

Ultrastructural Studies ◽

Proliferative Phase ◽

Contraceptive Devices ◽

Transmission Electron ◽

Intrauterine Contraceptive ◽

Myelin Figure

Recent ultrastructural studies on endometrial tissues from women wearing copper, wire intrauterine devices have disclosed morphological evidence of impaired glycogen degradation and secretion resulting in interference with the viability of blastocysts. Reduced microapocrine secretion observed with the scanning electron microscope supports this (1). In addition, organelle modifications have been observed in the epithelial cells of these women. The changes are seen in biopsies taken in the proliferative phase of the cycle and consist of mitochondrial vacuolation and myelin figure formation. These modifications disappear in the secretory phase and therefore have been regarded as reversible (2).The aim of the present studies was to investigate surface epithelial changes as well as organelle modifications in relation to the site of contact with an IUD that releases greater amounts of copper. Endometrial tissue was obtained from the uterine cavity of four young women wearing TCu-380-A intrauterine contraceptive devices for 4-6 weeks.

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