HOME OF THE COSMOPOLITAN AND THE TWENTIETH CENTURY HOME," IRVINGTON, N. Y. An Absolute Requirement of Every Household is a Woman's Home Journal How well THE TWENTIETH CENTURY The most important questions of life in all its phases thinkers. Instruction is given that is worth while. most salient topics. Its original promise of What is newest. What is most useful What is most entertaining Has, we believe, been kept to the letter. are being treated by the best Discussion is fullest upon the if best; if helpful; if interesting, The selection of periodicals for the home book-table for 1905 is a question of such importance that upon its decision depends the progress of every member of a family. We desire to submit this query: Should not THE TWENTIETH CENTURY HOME be a part of your list for 1905 ? And is it not worth while now to take advantage of the offer made to furnish free to every old or new subscriber who remits One Dollar before November 1st, for a year's subscription to THE TWENTIETH CENTURY HOME, the handsomely bound copy, in full cloth, of the World's Fair issue of "The Cosmopolitan" Magazine, containing 200 illustrations, all on coated paper, and twenty-five articles descriptive of the most interesting and instructive phases of the World's Fair. It is a study of the world's progress up to 1904 which should be read by both young and old-studied in every school, and preserved for future reference on the library shelves. Remit One Dollar to THE TWENTIETH CENTURY HOME COMPANY, Irvington-on-Hudson, N. Y. I consider it the BEST Ency clopedia yet published in every respect. P. N. JOHNSTON, Reference Librarian, New York Public Library. THE CHICAGO PUBLIC LIBRARY, CHICAGO, June 7th, '04. Scientific American, New York City. Dear Sir-The general scope and plan of the Americana" so thoroughly represents the book world of today that I am prompted to write you a few lines of appreciation. The character of the work must appeal to all students of art or science whether related to technology or the professions. The striking merit of this stupendous literary undertaking is the interesting and comprehensive manner in which subjects are treated; the important matter is brought forward while the less deserving is practically relegated and given little space. I am convinced of the wisdom of the congress of men who have had this work in charge-they fully appreciate the value of the reader's time and render the information without engendering the "fague of search." Americans will welcome this Bet of books as the most cour ageous undertaking in the publisher's domain. I am truly delighted with the tone and arrangement of this strictly American publication. Very respectfully, B. J. CIGRAND, Director Chicago Public Lib. Editor of Scientific American. Editor of Encyclopedia Americana. THE TIME IS SHORT CHAMBERS UNITED Dear Sir-I keep the Encyclopedia Americana at my chambers with a view to quickly obtain information upon the great variety of topics which are frequently involved in cases tried in the Circuit and District courts. I have found only one objection to its presence in my working library. It is that the charming style of many of the articles and the freshness and original character of its facts have more than once beguiled me into somewhat extensive excursions through the beautiful volumes when my attention might well have been, as Falstaff said, "fobbed with the rusty curb of old Father Antic the Law." Notwithstanding this temptation, I am grateful that I have been permitted to purchase the Americana. Believe me with great respect, Very sincerely yours, Our readers are notified that the time is short to take advantage of the special price, now open to advance subscribers to the ENCYCLOPEDIA AMERICANA published under the editorial supervision of the Scientific American. Our belief that the time had come when the American people demanded an American Encyclopedia, made by American scholars and specialists, and from the American point of view, has been more than justified. The orders received in advance of publication aggregate MORE THAN ONE MILLION DOLLARS An advance sale never before equaled in the history of publishing. Incredible as it may appear, our children, educated in American schools, taught by American instructors, and in accordance with American ideas, have been compelled to consult foreign books of reference for their information concerning even our American institutions, progress and achievements. To remedy this condition-to produce a National Work, which should bear the impress of the National American character-has been our aim and inspiration. More than a thousand American experts, each an authority upon his subject, have contributed the results of their ripest scholarship, study and experiment to this great work. Prepared under the editorial supervision of the Scientific American, FREDERICK CONVERSE BEACH Editor-in-chief, assisted by the largest corps of distinguished editors, specialists and experts ever engaged upon a similar work, our readers may be assured that it represents the highest type of modern scholarship, the latest results of modern scientific investigation. THE WORK-It is more than an Encyclopedia it is an AMERICANA. The departments of American History, American Biography, American Literature, and such fields in applied philosophy and science, as Government, Industries, Finance and the like which we can claim as essentially American, are treated more clearly and comprehensively than in any other work. Its 65,000 subjects if written in the heavy wordy English style, might easily have been extended to 50 volumes; but the American system of condensation has enabled us to cover the entire field of Twentieth Century Knowledge in Sixteen Royal Octavo Volumes. In its mechanical details, paper, binding, maps, plates and illustrations, it is superior to any work of its kind in existence. THE PLAN OF SALE which we have adopted has been devised for the purpose of giving those who order in advance of publication the benefit of the lowest wholesale price. We thus enable the intelligent and prompt purchaser to assist in making the first distribution of the AMERICANA a success, and we compensate him by giving him a great reduction in price in return for this co-operation and assistance. Let us tell you more about this great work and our new and novel plan of sale. THE SCIENTIFIC AMERICAN COMPILING DEPARTMENT 258 FIFTH AVENUE, NEW YORK will bring you sample pages, and full information about the work, the price, and the plan of sale to advance buyers, As the work is now nearly completed the special price offer will soon end. CYCLOPEDIA OF APPLIED ELECTRICITY F A PRACTICAL GUIDE for MECHANICS, ELECTRICIANS, ENGINEERING STUDENTS and ALL PERSONS INTERESTED IN ELECTRICITY IVE Volumes-2,500 Pages-size of pages, 8x10 inches, fully indexed. Handsomely and durably bound in morocco, profusely illustrated with over 2,000 full-page plates, diagrams, plans, sections, tables, formulæ, etc. Invaluable alike to the expert electrician and the apprentice. Thousands of dollars and years of preparation have been required to compile the material for this work. Every section written by an acknowledged authority. Prepared especially for practical, everyday use. Combines the best features of a textbook and a reference work, as every volume is supplemented with a carefully prepared list of test questions to impress the important points upon the reader's mind. A ready reference work for the experienced workman, as it is free from abstract theory and difficult mathematics. A limited number of introductory sets will be sent FREE for examination as soon as received from the press. We are printing an editon for our own use. By increasing the edition we can reduce the cost of manufacture. We are willing to share this saving with those who order now for future delivery. The regular price is $25.00. We will accept reservation orders until the books go to press, at $12.50just half the regular price. The books will be sent by express prepaid on approval and may be returned at our expense if not in every way satisfactory. Those desiring to have a set reserved at the reduced price must send $2.50 with their application as an evidence of good faith. This amount will be credited on the books, or returned if they are not kept. No further payments need be made until January 1st when payment of balance ($10) at the rate of $200 per month must begin. Reservations will be filed strictly in order received, those received after books go to press will be returned. Some of the Writers. PROF. F. B. CROCKER, head of Department of Electrical Engineering, Columbia University: author of the sections on Storage Batteries and Management of Dynamo Electric Machinery. PROF. WILLIAM ESTY, head of the Department of Electrical Engineering, Lehigh University: author of the section on Alternating Current Machinery. H. C. CUSHING, Jr., Wiring Expert and Consulting Engineer: author of the section on Wiring for Light and Power. PROF. DUGALD C. JACKSON, Collaborator with PROF. GEORGE C. SHAAD, University of Wisconsin: author of sections on Power Transmission, Electric Lighting and Central Stations. J. R. CRAVATH, Western Editor of the Street Railway Journal: author of the section on Street Railways. PROF. LOUIS DERR, Mass. Institute of Technology: WILLIAM BOYRER, Telephone Expert and Consulting Engineer; CHAS. THOM, Chief of Quadruplex Department Western Union Telegraph Co.: author of section on Telegraphy, and others. COUPON-Cut out and mail to AMERICAN SCHOOL OF CORRESPONDENCE at Armour Institute of Technology. The Enclosed find $2.50 for first payment on half-price sale of Cyclopedia of Applied Electricity. balance ($10) I will pay in monthly payments of $2.00 each, beginning January 1. It is understood that I may return the set at your expense within five days, and that you will refund the amount paid if the set is not wholly satisfactory to me. Also that you will return the $2.50 if my order is received too late for the half-price sale. (Tech. W. Nov.) Partial Table of Contents. Part I.-Static and Dynamic Electricity-Primary Batteries-Ohm's Law-Wire Calculations-Electrical Measurements-Wiring for Light and Power-Electric Telegraph, including the Duplex and Quadruplex. Part II.-Theory of Dynamo-Electric Machinery-Design and Construction of Dynamos and Motors-Types of Machines Storage Batteries, including Theory, Management and Types. Part III. Incandescent and Arc Lighting-Electric Railways, including Car Wiring. Line Construction, ThirdRail and Multiple-Unit Systems-Management of Dynamo-Electric Machinery-Power Station Work, including Boilers, Engines and Electrical Machinery-High Tension Transmission. Part IV.-Theory of Alternating Currents-Construction, Types and Operation of Alternators, Transformers, Induction Motors, Synchronous Motors and Rotary Con AMERICAN SCHOOL of CORRESPONDENCE At ARMOUR INSTITUTE OF TECHNOLOGY, CHICAGO Mention The Technical World. Read it if you are Busy If you have time to kill, don't read any further; unless you are deeply interested in what is happening from week to week the World over, don't read THE WEEK'S PROGRESS. Every busy man or woman with any taste, for keeping in touch with the news of the World over, should see THE WEEK'S PROGRESS. Seeing is subscribing. THE WEEK'S PROGRESS is as correct on facts as an encyclopaedia. It will be found as authoritative on most questions as if officially inspired. The Editorial Opinions are sound but fearless and independent. THE WEEK'S PROGRESS maintains the highest possible moral tone both in text and advertising; it contains the gist of hundreds of American and Foreign Publications. 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