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testing the Three- and Four-way circuits explained. The grounding of all metallic wiring systems and the reason for doing so shown and explained. The insulation of the metal parts of lamp fixtures and the reason for the same described and illustrated. 125 pages.

2nd Edition, revised and enlarged. Fully illustrated. Flexible cloth. Price

50 cents WHAT IS SAID OF THIS BOOK: “The information given is exact and exhaustive without being too technical or over

laden with details." —Druggists' Circular. HOW TO BECOME A SUCCESSFUL ELECTRICIAN. By Prof. T. O'CONOR

SLOANE.
Every young man who wishes to become a successful electrician should read this book.
It tells in simple language the surest and easiest way to become a successful electrician.
The studies to be followed, methods of work, field of operation and the requirements
of the successful electrician are pointed out and fully explained. Every young en-
gineer will find this an excellent stepping stone to more advanced works on electricity
which he must master before success can be attained. Many young men become dis-
couraged at the very outstart by attempting to read and study books that are far
beyond their comprehension, This book serves as the connecting link between the
rudiments taught in the public schools and the real study of electricity. It is inter-
esting from cover to cover. Eighteenth Revised 'Edition, just issued.

205 pages. Illustrated. Price

$1.00 STANDARD ELECTRICAL DICTIONARY. By T. O'CONOR SLOANE.

An indispensable work to all interested in electrical science. Suitable alike for the student and professional. A practical handbook of reference containing definitions of about 5,000 distinct words, terms and phrases. The definitions are terse and concise and include every term used in electrical science. Recently issued.

An entirely new edition. Should be in the possession of all who desire to keep abreast with the progress of this branch of science. In its arrangement and typography the book is very convenient. The word or term defined is printed in black-faced type which readily catches the eye, while the body of the page is in smaller but distinct type. The definitions are well worded, and so as to be understood by the non-technical reader. The general plan seems to be to give an exact, concise definition, and then amplify and explain in a more popular way. Synonyms are also given, and references to other words and phrases are made. A very complete and accurate index of fifty pages is at the end of the volume; and as this index contains all synonyms, and as all phrases are indexed in every reasonable combination of words, reference to the proper place in the body of the book is readily made. It is difficult to decide how far a book of this character is to keep the dictionary form, and to what extent it may assume the encyclopedia form. For some purposes, concise, exactly worded definitions are needed; for other purposes, more extended descriptions are required. This book seeks to satisfy both demands, and does it with considerable success. Complete, concise and convenient. 682 pages. 393 illustrations. Twelfth Edition. Price

$3.00 SWITCHBOARDS. By WILLIAM BAXTER, JR.

This book appeals to every engineer and electrician who wants to know the practical
side of things. It takes up all sorts and conditions of dynamos, connections and
circuits, and shows by diagram and illustration just how the switchboard shouid be
connected. Includes direct and alternating current boards, also those for arc lighting,
incandescent and power circuits. Special treatment on high voltage boards for power
transmission. 2d Edition.

190 pages.
Illustrated. Price

$1.50 TELEPHONE CONSTRUCTION, INSTALLATION, WIRING, OPERATION

AND MAINTENANCE. By W. H. RADCLIFFE and H. C. CUSHING.
This book is intended for the amateur, the wireman, or the engineer who desires to
establish a means of telephonic communication between the rooms of his home, office,
or shop. It deals only with such things as may be of use to him rather than with
theories.
Gives the principles of construction and operation of both the Bell and Independent
instruments; approved methods of installing and wiring them; the means of protecting
them from lightning and abnormal currents; their connection together for operation
as series or bridging stations; and rules for their inspection and maintenance. Line
wiring and the wiring and operation of special telephone systems are also treated.
Intricate mathematics are avoided, and all apparatus, circuits and systems are thor-
oughly described. The appendix contains definitions of units and terms used in the

text. Selected wiring tables, which are very helpful, are also included. Among the subjects treated are Construction, Operation, and Installation of Telephone Instruments; Inspection and Maintenance of Telephone Instruments; Telephone Line Wiring; Testing Telephone Line Wires and Cables; Wiring and Operation of Special Telephone Systems, etc. 2nd Edition, revised and enlarged: 223 pages. 154 illustrations

$1.00 WIRELESS TELEGRAPHY AND TELEPHONY SIMPLY EXPLAINED. By

ALFRED P. MORGAN.
This is undoubtedly one' of the most complete and comprehensible treatises on the
subject ever published, and a close study of its pages will enable one to master all the
details of the wireless transmission of messages. The author has filled a long-felt
want and has succeeded in furnishing a lucid, comprehensible explanation in simple
language of the theory and practice of wireless telegraphy and telephony.
Among the contents are: Introductory; Wireless Transmission and Reception-The
Aerial System, Earth Connections—The Transmitting Apparatus, Spark Coils and
Transformers, Condensers, Helixes, Spark Gaps, Anchor Gaps, Aerial Switches—The
Receiving Apparatus, Detectors, etc. -Tuning and Coupling, Tuning Coils, Loose
Couplers, Variable Condensers, Directive Wave Systems --Miscellaneous Apparatus,
Telephone Receivers, Range of Stations, Static Interference- Wireless Telephones,
Sound and Sound Waves, The Vocal Cords and Ear-Wireless Telephone, How Sounds
Are Changed into Electric 'Waves— Wireless Telephones, The Apparatus--Summary.
154 pages.
156 engravings. Price

$1.00 WHAT IS SAID OF THIS BOOK: “This book should be in both the home and school library.”The Youths' Instructor. WIRING A HOUSE. By HERBERT PRATT.

Shows a house already built; tells just how to start about wiring it; where to begin; what wire to use; how to run it according to Insurance Rules; in fact, just the information you need. Directions apply equally to a shop. Fourth edition 25 cents

FACTORY MANAGEMENT, ETC.

MODERN MACHINE SHOP CONSTRUCTION, EQUIPMENT AND MANAGE

MENT. By 0. E, PERRIGO, M.E.
The only work published that describes the modern machine shop or manufacturing
plant from the time the grass is growing on the site intended for it until the finished
product is shipped. By a careful study of its thirty-two chapters the practical man
may economically build, efficiently equip, and successfully manage the modern machine
shop or manufacturing establishment. Just the book needed by those contemplating
the erection of modern shop buildings, the rebuilding and reorganization of old ones,
or the introduction of modern shop methods, time amd cost systems. It is a book
written and illustrated by a practical shop man for practical shop men who are too
busy to read theories and want facts. It is the most complete all-around book of its
kind ever published. It is a practical book for practical men, from the apprentice in
the shop to the president in the office. It minutely describes and illustrates the most
simple and yet the most efficient time and cost system yet devised. Price: $5.00

FUEL

COMBUSTION OF COAL AND THE PREVENTION OF SMOKE. By WM. M.

RR. This book has been prepared with special reference to the generation of heat by the combustion of the common fuels found in the United States, and deals particularly with the conditions necessary to the economic and smokeless combustion of bituminous coals in Stationary and Locomotive Steam Boilers. The presentation of this important subject is systematic and progressive. The arrangement of the book is in a series of practical questions to which are appended accurate answers, which describe in language, free from technicalities, the several processes involved in the furnace combustion of American fuels; it clearly states the essential requisites for perfect combustion, and points out the best methods for furnace construction for obtaining the greatest quantity of heat from any given quality of coal. Nearly 350 pages, fully illustrated. Price .

$1.00

GAS ENGINES AND GAS

THE GASOLINE ENGINE ON THE FARM: ITS OPERATION, REPAIR AND

USES. By XENO W. PUTNAM.
This is a practical treatise on the Gasoline and Kerosene Engine intended for the man
who wants to know just how to manage his engine and how to apply it to all kinds of
farm work to the best advantage.
This book abounds with hints and helps for the farm and suggestions for the home
and housewife. There is so much of value in this book that it is impossible to ade-
quately describe it in such small space. Suffice to say that it is the kind of a book
every farmer will appreciate and every farm home ought to have. Includes selecting
the most suitable engine for farm work, its most convenient and efficient installation,
with chapters on troubles, their remedies, and how to avoid them. The care and
management of the farm tractor in plowing, harrowing, harvesting and road grading
are fully covered; also plain directions are given for handling the tractor on the road.
Special attention is given to relieving farm life of its drudgery by applying power to
the disagreeable small tasks which must otherwise be done by hand. Many home-
made contrivances for cutting wood, supplying kitchen, garden, and barn with water,
loading, hauling and unloading hay, delivering grain to the bins or the feed trough
are included; also full directions for making the engine milk the cows, churn, wash,
sweep the house and clean the windows, etc. Very fully illustrated with drawings of
working parts and cuts showing Stationary, Portable and Tractor Engines doing all
kinds of farm work. All money-making farms utilize power. Learn how to utilize
power by reading the pages of th book. It is an aid to the result getter, invaluable
to the up-to-date farmer, student, blacksmith, implement dealer and, in fact, all who
can apply practical knowledge of stationary gasoline engines or gas tractors to advan-
tage. 530 pages.
Nearly 180 engravings. Price.

$2.00
WHAT IS SAID OF THIS BOOK:
"Am much pleased with the book and find it to be very complete and up-to-date.
I will heartily recommend it to students and farmers whom I think would stand in
need of such a work, as I think it is an exceptionally good one."—N. S. Gardiner,
Prof. in Charge, Clemson Agr. College of S. C.; Dept. of Agri. and Agri. Exp. Station,
Clemson College, S. C.
"I feel that Mr. Putnam's book covers the main points which a farmer should know."
-R. T. Burdick, Instructor in Agronomy, University of Vermont, Burlington, Vt.
It will be a valuable addition to our library upon Farm Machinery."-James A.
Farra, Inst. in Agri. Engineering, State University of Ky., Lexington, Ky.

GASOLINE ENGINES: THEIR OPERATION, USE AND CARE. By A. HYATT

VERRILL.
The simplest, latest and most comprehensive popular work published on Gasoline
Engines, describing what the Gasoline Engine is; its construction and operation; how
to install it; how to select it; how to use it and how to remedy troubles encountered.
Intended for Owners, Operators and Users of Gasoline Motors of all kinds. This
work fully describes and illustrates the various types of Gasoline Engines used in
Motor Boats, Motor Vehicles and Stationary Work. The parts, accessories and
appliances are described, with chapters on ignition, fuel, lubrication, operation and
engine troubles. Special attention is given to the care, operation and repair of motors,
with useful hints and suggestions on emergency repairs and makeshifts. A complete
glossary of technical terms and an alphabetically arranged table of troubles and their
symptoms form most valuable and unique features of this manual. Nearly every
illustration in the book is original, having been made by the author. Every page is
full of interest and value. A book which you cannot afford to be without.

275 pages. 152 specially made engravings. Price

$1.50

GAS, GASOLINE, AND OIL ENGINES. By GARDNER D. Hiscox.

Just issued, 21st revised and enlarged edition. Every user of a gas engine needs this book. Simple, instructive, and right up-to-date. The only complete work on the subject. Tells all about the running and management of gas, gasoline and oil engines, as designed and manufactured in the United States. Explosive motors for stationary marine and vehicle power are fuily treated, together with illustrations of their parts and tabulated sizes, also their care and running are included. Electric ignition by induction coil and jump spark are fully explained and illustrated, including valuable information on the testing for economy and power and the erection of power plants.

Price.

The rules and regulations of the Board of Fire Underwriters in regard to the installation and management of gasoline motors is given in full, suggesting the safe installation of explosive motor power. A list of United States Patents issued on gas, gasoline, and oil engines and their adjuncts from 1875 to date is included.

640 pages.

435 engravings. Folding plates. Price

$2.50 GAS ENGINE CONSTRUCTION, OR HOW TO BUILD A HALF-HORSE

POWER GAS ENGINE. By PARSELL and WEED.
A practical treatise of 300 pages describing the theory and principles of the action of
Gas Engines of various types and the design and construction of a half-horse-powt:
Gas Engine, with illustrations of the work in actual progress, together with the dimen-
sioned working drawings, giving clearly the sizes of the various details; for the student,
the scientific investigator, and the amateur mechanic. This book treats of the subject
more from the standpoint of practice than that of theory. The principles of operation
of Gas Engines are clearly and simply described, and then the actual construction of a
half-horse-power engine is taken up, step by step, showing in detail the making of the
Gas Engine. 3d Edition. 300 pages.

$2.50 HOW TO RUN AND INSTALL GASOLINE ENGINES. By C. Von CULIN.

Revised and enlarged edition just issued. The object of this little book is to furnish a pocket instructor for the beginner, the busy man who uses an engine for pleasure or profit, but who does not have the time or inclination for a technical book, but simply to thoroughly understand how to properly operate, install and care for his own engine. The index refers to each trouble, remedy, and subject alphabetically. Being a quick reference to find the cause, remedy and prevention for troubles, and to become an expert with his own engine. Pocket size. Paper binding. Price

25 cents MODERN GAS ENGINES AND PRODUCER GAS PLANTS. By R. E. MATHOT.

A guide for the gas engine designer, user, and engineer in the construction, selection, purchase, installation, operation, and maintenance of gas engines. More than one book on gas engines has been written, but not one has thus far even encroached on the field covered by this book. Above all Mr. Mathot's work is a practical guide. Recognizing the need of a volume that would assist the gas engine user in understanding thoroughly the motor upon which he depends for power, the author has discussed his subject without the help of any mathematics and without elaborate theoretical explanations. Every part of the gas engine is described in detail, tersely, clearly, with a thorough understanding of the requirements of the mechanic. Helpful suggestions as to the purchase of an engine, its installation, care, and operation, form a most

valuable feature of the work. 320 pages. 175 detailed illustrations. Price . $2.50 THE MODERN GAS TRACTOR. By VICTOR W. Pagé.

A complete treatise describing all types and sizes of gasoline, kerosene and oil tractors. Considers design and construction exhaustively, gives complete instructions for care, operation and repair, outlines all practical applications on the road and in the field. The best and latest work on farm tractors and tractor power plants. A work needed by farmers, students, blacksmiths, mechanics, salesmen, implement dealers, designers and engineers. 500 pages. Nearly 300 illustrations and folding plates. Price $2.00

GEARING AND CAMS

BEVEL GEAR TABLES. By D. AG. ENGSTROM.
A book that will at once commend itself to mechanics and draftsmen.

Does away with all the trigonometry and fancy figuring on bevel gears, and makes it easy for anyone to lay them out or make them just right. There are 36 full-page tables that show every necessary dimension for all sizes or combinations you're apt to need. No puzzling, figuring or guessing. Gives placing distance, all the angles (including cutting angles), and the correct cutter to use. A copy of this prepares you for anything in the bevel-gear line. 3d Edition.

66 pages.

$1.00 CHANGE GEAR DEVICES. By Oscar E. PERRIGO.

A practical book for every designer, draftsman, and mechanic interested in the invention and development of the devices for feed changes on the different machines requiring such mechanism. All the necessary information on this subject is taken up, analyzed, classified, sifted, and concentrated for the use of busy men who have not the time to go through the masses of irrelevant matter with which such a subject is usually encumbered and select such information as will be useful to them.

It shows just what has been done, how it has been done, when it was done, and who did it. It saves time in hunting up patent records and re-inventing old ideas. 88 pages.

$1.00

DRAFTING OF CAMS. By Louis ROUILLION.

The laying out of cams is a serious problem unless you know how to go at it right. This puts you on the right road for practically any kind of cam you are likely to run up against. 3d Edition.

25 cents HYDRAULICS

HYDRAULIC ENGINEERING. By GARDNER D. Hiscox.

A treatise on the properties, power, and resources of water for all purposes. Including the measurement of streams, the flow of water in pipes or conduits; the horse-power of falling water, turbine and impact water-wheels, wave motors, centrifugal, reciprocating and air-lift pumps. With 300 figures and diagrams and 36 practical tables. All who are interested in water-works development will find this book a useful one, because it is an entirely practical treatise upon a subject of present importance, and cannot fail in having a far-reaching influence, and for this reason should have a place in the working library of every engineer. Among the subjects treated are: Historical Hydraulics, Properties of Water, Measurement of the Flow of Streams; Flow from Sub-surface Orifices and Nozzles; Flow of Water in Pipes; Siphons of Various Kinds; Dams and Great Storage Reservoirs; City and Town Water Supply; Wells and Their Reinforcement; Air Lift Methods of Raising Water; Artesian Wells; Irrigation of Arid Districts; Water Power; Water Wheels; Pumps and Pumping Machinery; Reciprocating Pumps; Hydraulic Power Transmission; Hydraulic Mining; Canals; Ditches; Conduits and Pipe Lines; Marine Hydraulics; Tidal and Sea Wave Power, etc. 320 pages. Price :

$4.00 INVENTIONS-PATENTS

INVENTORS' MANUAL, HOW TO MAKE A PATENT PAY.

This is a book designed as a guide to inventors in perfecting their inventions, taking
out their patents and disposing of them. It is not injany sense a Patent Solicitor's
Circular nor a Patent Broker's Advertisement. No advertisements of any description
appear in the work. It is a book containing a quarter of a century's experience of a
successful inventor, together with notes based upon the experience of many other
inventors.
Among the subjects treated in this work are: How to Invent. How to Secure a
Good Patent. Value of Good Invention. How to Exhibit an Invention. How to
Interest Capital. How to Estimate the Value of a Patent. Value of Design Patents.
Value of Foreign Patents. Value of Small Inventions. Advice on Selling Patents.
Advice on the Formation of Stock Companies. Advice on the Formation of Limited
Liability Companies. Advice on Disposing of Old Patents. Advice as to Patent
Attorneys. Advice as to Selling Agents. Forms of Assignments. License and Con-
tracts. State Laws Concerning Patent Rights. 1900 Census of the United States by
Counts of Over 10,000 Population. Revised edition.

120 pages.

Price. $1.00

KNOTS

KNOTS, SPLICES AND ROPE WORK. By A. HYATT VERRILL.

This is a practical book giving complete and simple directions for making all the most useful and ornamental knots in common use, with chapters on Splicing, Pointing, Seizing, Serving, etc. This book is fully illustrated with one hundred and fifty original engravings, which show how each knot, tie or splice is formed, and its appearance when finished. The book will be found of the greatest value to Campers, Yachtsmen, Travelers, Boy Scouts, in fact, to anyone having occasion to use or handle rope or knots for any purpose, The book is thoroughly reliable and practical, and is not only a guide, but a teacher. It is the standard work on the subject. Among the contents are: 1. Cordage, Kinds of Rope. Construction of Rope, Parts of Rope Cable and Bolt Rope. Strength of Rope, Weight of Rope. 2. Simple Knots and Bends. Terms Used in Handling Rope. Seizing Rope. 3. Ties and Hitches. 4. Noose, Loops and Mooring Knots. 5. Shortenings, Grommets and Salvages. 6. Lashings, Seizings and Splices. 7. Fancy Knots and Rope Work. 128 pages.

150 original engravings. Price

60 cents

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