The system suggested to the last Congress by Mr. E. Hospitalier, of Paris (see Appendix IV.), is recommended by your committee, although doubtless some amendments may be found desirable.

DEFINITIONS.

6. Defining the following terms:-Impressed electromotiveforce, inductivity, inductance, reluctivity, Matthiessen's standard, north and south pole.

The following definitions are suggested:

The impressed electromotive force is the ratio of the total activity in an electrically conducting circuit to its instantaneous current-strength.

The inductivity at any point in an isotropic medium is the ratio, added to unity, of 4 times the intensity of magnetization there existing, to the magnetizing flux density. Inductivity is synonymous with "permeability." The electro-magnetic dimensional formula is L° M° To; the conventional symbol is u. μ.

Inductance. (a) Self inductance is the ratio of the total magnetic induction linked with, and established by an electric current, to the uniform strength of the same. The inductance of a conducting circuit is constant when its environing medium has constant inductivity. (b) The mutual inductance of one electric circuit upon another is the ratio of the total magnetic induction linked with the second, due to a uniform current in the first, to the strength of that current. The mutual inductance between two electric circuits is reciprocally equal when the environing medium has constant inductivity. The electro-magnetic dimensional formula is L M° To. The absolute unit is one centimetre; the practical unit, one henry.

The reluctivity of a medium at any point is the volume differential of the reluctance thereat. Simple definition: Reluctivity is the reluctance per unit volume. The electro-magnetic dimensional formula is L° Mo To. The absolute unit is one c. G. s. unit of reluctance per cubic centimetre; the proposed practical unit is the same or about one oersted per cubic earth quadrant.

The resistance of copper known as Matthiessen's standard shall be defined as follows:-The resistance of a soft copper wire one metre long, weighing one gramme, is 0.14365 B. A. units at 0° C. This definition is recommended by the Committee of the American Institute of Electrical Engineers on Matthiessen's Standard (see Appendix V.). The reasons for selecting it are given in that report.

The north pole of a magnet to be defined as being that which seeks the geographic north pole, and the south pole that which seeks the geographic south pole. This is the generally accepted definition, but it is thought desirable to formally define it.

EXPRESSIONS.

Defining and adopting expressions :-For alternating currents of more than one phase; for describing phenomena of alternating currents and of electro-magnetic waves.

It is recommended to adopt the following expressions: "simple" alternating current for the usual alternating currents in which there is practically but a single phase; "di-phase" alternating currents for two alternating currents whose phases differ in time by 90 or 270 deg.; "tri-phase" alternating currents for three alternating currents whose phases differ in time by 60 or 120 deg; "poly-phase" alternating currents for such as have more than three phases.

For expressions describing phenomena of alternating currents and electro-magnetic waves, your committee solicits suggestions.

UNIVERSAL USE.

8. Recommending the more universal use:

Of the term "voltage" as synonymous with "difference of electrical potential" or P. D. in place of the terms "potential," "tension," or "pressure," the use of which in this sense it is recommended to abandon.

Of the term "transformer" instead of "converter"; Of the term " dynamotor" for a continuous current transformer;

Of the term "continuous current" instead of "direct current";

Of the term "kilowatt" instead of "horse power"; Of the metric system of weights and measures, and suggesting means by which its introduction will be facilitated.

PROGRAMME.

Regarding the programme for carrying out this work in the most satisfactory manner to all parties, and with the least loss of time, your Committee's recommendations and suggestions are as follows:

PREPARATORY DISCUSSIONS.

It cannot be too strongly urged that an International Congress is the place to close, but not to open a discussion on questions about which international agreement is to be had; it is therefore urgently recommended that action be taken at once to open the discussion of such matters now, in order that expressions of opinions, and, if possible, agreements, may be arrived at prior to the meeting of the Congress. To this end your Committee recommends that the suggestions embodied in this report, or as many of them as you may see fit to designate, be printed and sent to all the leading electrical and physical societies and journals in this country and abroad, with a request that they aid this work by making them public, by freely discussing them, and by sending copies of such discussions and any further suggestions to the General Congress Committee of this Institute, care of the Secretary, 12 West Thirty-first street, New York City. That a sub committee of the Institute prepare from time to time a classified summary of such discussions to be sent to the leading electric and physical journals for publication here and abroad, and that it present a final summary of this international discussion at the Congress. This discussion ought to be closed by July 1, 1893.

It is recommended also that this Institute invite other societies to cooperate with it by appointing special committees to discuss and report to their respective societies on these international questions and to publish their conclusions in the electrical journals of their country.

It has been suggested that various committees be appointed to prepare reports on the international questions on which agreement is desired, and to submit these at the meeting of the Congress. Your Committee, however, believes that to postpone the discussion until the Congress is in session, would lead to no satisfactory results, as was shown at the last Congress of 1891, in Frankfort. It therefore urges that the discussion take place through the medium of the journals prior to the meeting of the Congress, and that the only report submitted to the Congress be a summary of such discussions.

MEETINGS.

Regarding the meetings of the Congress, your Committee recommends that, as in the Paris Congress of 1889, the meetings be divided into (a) General Meetings, one at the opening and one

at the closing of the Congress, which are to be devoted to the consideration of general questions and those on which agreements are desired, and to the reading of papers of a general character; (b) Sectional Meetings for the reading of all other papers. The following division into sections is recommended:

1. Electro-physics, units, measurements, and all electrical matters of a purely scientific nature.

2. Dynamos, motors, transformers, etc.

3. Systems, central stations, installations, lamps, etc. 4. Electric telegraphy, telephony, and signaling.

5. Electric railways.

6. Electro-chemistry, batteries, electro-metallurgy.
7. Electro-physiology and electro-therapeutics.
8. Legal questions.

PAPERS.

It is suggested that specific invitations be extended by the Congress Auxiliary to prominent electrical engineers and physicists to prepare papers on specified subjects to be read and discussed at the Congress meetings. Also, that a general invitation be extended for other papers, which are to be submitted not later than July 15, 1893, to a committee on papers appointed by the Chairman of the Congress Auxiliary; that this committee shall examine and accept or return the latter, and at its discretion shall print any or all of those accepted as well as those solicited, in form for circulation at least one week prior to the meeting at which they are to be read; that the papers shall be read in full, in abstract or by title, as that committee shall direct.

The following subjects of papers are offered as a suggestion to the Congress Auxiliary merely as a basis and not as a complete list.

The criterion of sensitiveness of galvanometers; or on the theory of their construction.

The working of National or Municipal Laboratories for testing meters and instruments.

The practical results and economy of the employment of accumulators in Central Station systems of supply.

On the relation between weight of copper and iron in dynamos and their output.

Nomenclature and notation of magnetic circuit-or on Standard and Units of Magnetism.

Magnetism.

On the economic use of transformers under various conditions of supply.

Electricity meters from an European standpoint.

Electricity meters from a British standpoint.

Electricity meters, from an American standpoint.

Choice of materials for standard of electrical resistance.
Nomenclature of phenomena of electro-magnetic waves.

Standards for electrical measurement.

Alternating current transformers from an American standpoint.
High frequency and high potential phenomena.

Dynamo construction.

Your Committee suggests that papers should be solicited by the General Congress Committee of this Institute on the work of the early electricians of this and foreign countries considered from a modern standpoint, and their importance in the development of the science of electricity, including descriptions and illustrations of models and apparatus used.

TRANSACTIONS.

Your Committee suggests that the proper authorities be requested to have a stenographic report made of the proceedings and discussions at all the meetings of the Electrical Congress, and that this report, including such of the papers and discussions as a commitee appointed for the purpose shall direct, shall be printed and published in book form; that each member of the Congress be entitled to one copy of this report on the payment of $1 (one dollar), and non-members on the payment of $5 (five dollars).

MEMBERSHIP.

It is suggested that the membership of the Congress be divided into delegated members and members; that the dues for each shall be $5 (five dollars); that only delegated members and members be admitted to the meetings, and be permitted to take part in the discussions; that any one shall be entitled to become a member; that delegated members shall be appointed by governments, physical and electrical societies, and shall be approved by an international committee whose decision shall be final; that questions on which international agreement is desired, be decided by the delegated members, whose decisions shall be submitted to the whole Congress for approval or rejection in part or in whole, but not for alteration.

It is recommended that the United States Government be requested to extend a formal invitation to foreign governments and societies to send delegates to this Congress.