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FIDELITY TRUST COMPANY

Nos. 325-331 CHESTNUT ST.

Nos. 43-53 SOUTH FOURTH ST.

Capital and Surplus, $15,000,000

Executes Trusts of Every Description.

Securities and Valuables Taken for Safe Keeping.

Pays Interest on Deposits.

Safes for Rent in Burglar-proof Vaults.

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TARR
YSTEM OF

EWAGE DISPOSAL

W. N. JENNINGS

BUSINESS
PHOTOGRAPHY

1305 ARCH ST.

PHILA.

BANCROFT & BROTHER

ESTABLISHED 1956

INSURANCE IN ALL ITS BRANCHES 264 Drexel Building, Philadelphia

High and Low Pressure STEAM FITTING

PLUMBING

John Borden and Bro.

637 North 19th Street

SAMUEL P. SADTLER & SON

Consulting Chemical Experts

Analyses and reports made in all branches of industrial and applied chemistry. Expert assistance in the development of chemical processes and patents, and preparation of testimony in chemical patent suits. Raw materials and waste products of manufacturing processes specially studied and reported upon.

Office and Laboratory-39 S. 10th St., Phila.
Experimental Shop-Chestnut Hill, Pa.

Will dispose of sewage in a sanitary, odorless and efficient manner at a cost for maintenance of 90% less than any other system and 100% EFFICIENCY. Endorsements by leading scientific men and various Health Boards on file for your inspection.

GREEN-STARR ENGINEERING CO.

Civil and Sanitary Engineers

PERRY BUILDING, PHILADELPHIA, PA.

Your courtesy in mentioning the Journal will be appreciated

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THE FRANKLIN INSTITUTE

President.. .J. T. FENNELL
Vice-President..S. A. STONEBACK
Secretary
ALFRED RIGLING

Treasurer...... GEORGE S. CULLEN

The Association was organized in 1908, and has for its object the promotion of the interests of the Institute, its school and the alumni

Every graduate of the Institute's School and every student having completed two or more terms of the school course may become a member.

Regular meetings of the Association are held in May and October.

Members have the privilege of attending the Institute lectures.

PATENTS

Philadelphia

Procured for In

ventions and designs. Trade

marks Registered, Patent Causes, Examinations, Searches, etc. Call or send for Book of Instructions.

WIEDERSHEIM & FAIRBANKS

John A. Wiedersheim
Wm. Caner Wiederseim

H. Hayward Fairbanks

DeLong Building

1232 Chestnut St. Philadelphia

EVERYTHING IN THE

Draughting and

Engineering Line

Drawing and Blue Print Papers
F. WEBER & CO.

1125 Chestnut Street

Bevel Gear Generators

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BEVEL GEARS

Cut Theoretically Correct Special Facilities for Cutting Worm, Spiral Mitre, Internal and Elliptical Gear Wheels THE BILGRAM

MACHINE WORKS

1229 Spring Garden St., Phila., Pa.

Charles W. Messner

3704 N. Broad Street Philadelphia Electrical Contractor

Both Phones

Philadelphia Book Co.
ENGINEERING AND
TECHNICAL BOOKS
17 SOUTH NINTH STREET
Bell Telephone
Walnut 1002

Your courtesy in mentioning the Journal will be appreciated

New Fourth Edition

Revised and Enlarged

Suplee's Mechanical Engineer's Reference Book

A Hand-book of Tables, Formulas, and Methods for Engineers, Students and Draftsmen

By Henry Harrison Suplee, B.Sc., M.E.

Member American Society of Mechanical Engineers; Membre de la Société Des Ingénieurs Civils de France; Mitglied des Vereines Deutscher Ingenieurs;

Member of The Franklin Institute.

Illustrated. 964 pages. 16mo. Full limp leather, round corners, gilt edges, thumb index. $5.00 net

T

HIS book is intended to form a standard hand-book

for the mechanical engineer and the designer of machinery, supplying in convenient form the general information which is constantly required. In the new fourth edition the few errors in the previous edition have been corrected and an Appendix of forty pages added, containing a variety of useful information.

Several features make this the one up-to-date complete accurate work for mechanical engineers,-more space has been devoted to Mathematics than in any other similar reference book in English,-the subject of machine design is very amply treated,-the arrangement of the matter is unexcelled, and fully illustrated, which together with the complete thumb index, makes it just the book for quick reference.

Send for Bulletin of New Scientific Books

J. B. LIPPINCOTT COMPANY

Publishers

Philadelphia

Your courtesy in mentioning the Journal will be appreciated

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The Franklin Institute

DEVOTED TO SCIENCE AND THE MECHANIC ARTS

Edited by R. B. OWENS, E.E., M.A., D.Sc., F.R.S.C.

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The Production of Light by Animals. By Ulric Dahlgren

E. H. Sanborn
No. 5

513

Recent Researches in Electricity at the Bureau of Standards. By E. B. Rosa 539
Early Municipal Water Works at Panama. By Carleton E Davis

561

The Conductivity and Viscosity of Solutions of Electrolytes in Formamid.
By P. B. Davis, W. S. Putnam, and Harry C. Jones

567

On the Retention of Activity by Urease and by Oxidase after Exposure to
the Temperature of Liquid Air. By Joseph Samuel Hepburn and Charles
Blizard Bazzoni

603

Notes from the U. S. Bureau of Standards:

A New Relation from Planck's Law

607

The Microstructural Changes Accompanying the Annealing of Bronze (Cu88,
Sn 10, Zn2)

607

Compressive Strength of Portland Cement Mortars and Concretes

608

Standard Test Specimen of Zinc Bronze (Cu88, Sn10, Zn2). Part II-Micro

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Earth Resistance and its Relation to the Electrolysis of Underground Structures 614
Foreign Specifications for Railway Material

615

Notes from Nela Research Laboratory:

The Relation between Spectral Color and Stimulation in the Lower Organisms. 617
Temperature and Blackening Effects in Helical Tungsten Filaments

619

The Franklin Institute:

Stated Meeting, October 20, 1915

623

Committee on Science and the Arts, Stated Meeting, October 6, 1915

Section of Physics and Chemistry, Stated Meetings, October 7 and October 14,
1915

624

624

Minute of the Board of Managers on the Death of John T. Morris.

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FIVE DOLLARS PER YEAR (Foreign Postage Additional).

SINGLE NUMBERS, FIFTY CENTS.
Entered at the Post-office at Philadelphia, Pa., as second-class matter.
Copyright, 1915, by THE FRANKLIN INSTITUTE.

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UNDERWOOD

The Latest Proof of TYPEWRITER SUPERIORITY

UNDERWOOD

"The Machine You Will Eventually Buy"

UNDERWOOD BUILDING

NEW YORK

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