I. On a new form of dynamo-magneto-electric machine

1875 ◽  
Vol 23 (156-163) ◽  
pp. 496-498
Keyword(s):  
Great Part ◽  
Electric Machine ◽  
Platinum Wire ◽  
External Work ◽  
New Form ◽  
Charles Wheatstone

In the first machines constructed by Siemens and Wheatstone in 1867 (see Royal Society’s Transactions) the power of augmenting the magnetism by successive currents, developed from the original residua magnetism contained in the iron, was fully demonstrated, and it was shown that the power of the machine could thereby be developed to great extent; but the only means for obtaining external work was by the insertion in the circuit of a magnet or coil so that the secondary discharge could be utilized. Sir Charles Wheatstone also showed that a great part of the current could be shunted through a platinum wire, care being taken that the resistance of the platinum wire was sufficient to compel a large part of the current to pass round the electromagnet.

scholarly journals IV. On a magneto-electric machine

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.

3. Note of a New Form of Armature and Break for a Magneto-Electric Machine

1872 ◽  
Vol 7 ◽  
pp. 488-498
Author(s):  
R. M. Ferguson
Keyword(s):  
Cast Iron ◽  
Electric Machine ◽  
New Form ◽  
Rectangular Piece

The magneto-electric machine, which I am about to describe, approximates in its general arrangements to Ladd's hand machine. In it Mr Ladd makes use of a compound Siemens' armature, consisting of two separate armatures placed in length, and revolving round the same axis, with their coils at right angles to each other. The armature revolves between the poles of an electro-magnet, of the description introduced by Mr Wilde. The electro-magnet, in the present instance, is made of a rectangular piece of boiler-plate, three-quarters of an inch in thickness, bent so as to form three sides at right angles to each other, as shown (in section) in fig. 1. The upright sides (P P' P) are nearly 9 inches high and 11 inches in length, and the top of the same length is 6 inches broad. Pieces of cast-iron (N and S) are put in the open end to form the poles of the magnet.

scholarly journals A new form of Wehnelt interrupter

1921 ◽  
Vol 99 (699) ◽  
pp. 324-330 ◽  
Keyword(s):  
Current Density ◽  
Mean Value ◽  
Platinum Wire ◽  
Original Form ◽  
Wire Electrode ◽  
Large Current ◽  
Large Current Density ◽  
The Mean ◽  
New Form ◽  
The Wire

The original form of Wehnelt Interrupter has many disadvantages. Unless special precautions for cooling the apparatus are taken, the solution soon boils, and the interrupter ceases to work. The large current density causes rapid disintegration of the platinum wire, and there is considerable expense in renewing it. The interrupter cannot be used with alternating currents owing to the melting of the wire when it is the cathode. Sulphuric acid has a fairly large electrical conductivity, compared with other electrolytes, and the mean value of the current density at the wire electrode is large. There is, as a result, considerable heat developed in the volume of the acid. If a high resistance electrolyte is substituted, the current density at the platinum wire is much smaller, and the heating effect is reduced. The fumes arising from the acid, and also the spraying, when the interrupter is in action, are objectionable.

scholarly journals XXVI. On the dynamo-electric current, and on certain means to improve its steadiness

1880 ◽  
Vol 171 ◽  
pp. 1071-1088 ◽  
Keyword(s):  
Electric Current ◽  
Royal Society ◽  
Platinum Wire ◽  
Short Paper ◽  
Abundant Evidence ◽  
Set Up ◽  
Charles Wheatstone

On the 14th February, 1867, I communicated a short paper to the Royal Society, describing the accumulative or dynamo-electrical principle of action, the conception of which I attributed to my brother Dr. Werner Siemens. When the paper was read, another paper followed by Sir Charles Wheatstone (sent in on the 24th February) also describing this principle of action, thus showing that the same line of thought had occupied that eminent philosopher. In illustration of my paper I exhibited a machine of my design, embodying the accumulative principle of action, which furnished abundant evidence of the powerful nature of the current that could be thus produced. It consisted of two horseshoe electromagnets, between the poles of which a Siemens armature could be made to rotate, the machine being furnished with a handle or pulley for that purpose. A commutator was provided, by which the alternating currents set up in the rotating coil (after a first impulse had been given) were directed through the coils of the stationary electromagnets in a continuous manner, and proceeded thence outward to ignite a platinum wire of some 12" in length, or to perform other work.

Fine Structure of Platelet Interaction with a New Microcrystalline Collagen Preparation

1974 ◽  
Vol 32 ◽  
pp. 58-59
Author(s):  
W. H. Zucker ◽  
R. G. Mason
Keyword(s):  
Fine Structure ◽  
Platelet Aggregation ◽  
Hydrochloric Acid ◽  
Whole Blood ◽  
Platelet Adhesion ◽  
Hemostatic Agent ◽  
Native Collagen ◽  
Fibrillar Morphology ◽  
Clinical Interest ◽  
New Form

Platelet adhesion initiates platelet aggregation and is an important component of the hemostatic process. Since the development of a new form of collagen as a topical hemostatic agent is of both basic and clinical interest, an ultrastructural and hematologic study of the interaction of platelets with the microcrystalline collagen preparation was undertaken.In this study, whole blood anticoagulated with EDTA was used in order to inhibit aggregation and permit study of platelet adhesion to collagen as an isolated event. The microcrystalline collagen was prepared from bovine dermal corium; milling was with sharp blades. The preparation consists of partial hydrochloric acid amine collagen salts and retains much of the fibrillar morphology of native collagen.

The staining pattern of the tropomyosin sequence is displayed in a new paracrystal

1986 ◽  
Vol 44 ◽  
pp. 150-151
Author(s):  
M.K. Lamvik ◽  
L.L. Klatt
Keyword(s):  
Amino Acid ◽  
Amino Acid Sequence ◽  
Staining Pattern ◽  
Banding Patterns ◽  
Mass Thickness ◽  
New Form

Tropomyosin paracrystals have been used extensively as test specimens and magnification standards due to their clear periodic banding patterns. The paracrystal type discovered by Ohtsuki1 has been of particular interest as a test of unstained specimens because of alternating bands that differ by 50% in mass thickness. While producing specimens of this type, we came across a new paracrystal form. Since this new form displays aligned tropomyosin molecules without the overlaps that are characteristic of the Ohtsuki-type paracrystal, it presents a staining pattern that corresponds to the amino acid sequence of the molecule.

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