Einstein’s contributions to our ideas of time and space and to our knowledge of the universe in general must rank among the greatest achievements of the twentieth century. This little book gives a concise and lucid account of Einstein’s discoveries, but since these are so largely dependent on the work of Newton and his successors, the first two chapters are devoted to the latter.

_Panama._ Its Creation, Destruction, and Resurrection. =Philippe Bunau-Varilla.= Royal 8vo. 12/6 net.

A catalogue of technical and scientific books published by Constable & Company Ltd — Part 58

Messrs. Franklin and Charles’ List of Publications

A catalogue of technical and scientific books published by Constable & Company Ltd — Part 58

_Practical Physics._ =Franklin, Crawford and Macnutt.=

A catalogue of technical and scientific books published by Constable & Company Ltd — Part 58

Vol. I. PRECISE MEASUREMENTS—MECHANICS AND HEAT. 9/- net.

Vol. II. ELEMENTARY AND ADVANCED MEASUREMENTS IN ELECTRICITY AND MAGNETISM. 9/- net.

Vol. III. PHOTOMETRY. EXPERIMENTS IN LIGHT & SOUND. 7/- net.

_The Elements of Electrical Engineering._ =W. S. Franklin= and =William Esty=.

Vol. I. DIRECT CURRENT MACHINES: ELECTRIC DISTRIBUTION AND LIGHTING. 28/- net.

_Advanced Theory of Electricity & Magnetism._ =W. S. Franklin= and =Barry MacNutt=. 16/6 net.

_Elements of Electricity and Magnetism._ =W. S. Franklin= and =Barry MacNutt=. 12/- net.

_The Elements of Electrical Engineering._ =W. S. Franklin.= A Simplified Version of the “Elements” by =Franklin and Esty= (see above).

Vol. I. DIRECT AND ALTERNATING CURRENT MACHINES AND SYSTEMS. 28/- net.

Vol. II. ELECTRIC LIGHTING AND MISCELLANEOUS APPLICATIONS OF ELECTRICITY. 20/- net.

_A Calendar of Leading Experiments._ =W. S. Franklin= and =Barry MacNutt=. 16/6 net.

_The Elements of Calculus._ =Franklin=, =MacNutt= and =Charles=. 16/6 net.

_Dynamo Laboratory Manual._ =W. S. Franklin & William Esty.=

Vol. I. DIRECT-CURRENT STUDIES AND TESTS. 12/- net.

_Elementary Electricity and Magnetism._ =W. S. Franklin= and =Barry MacNutt=. 9/- net.

_Elementary Statics._ =Franklin= and =MacNutt=. 4/- net.

_Bill’s School and Mine._ A Collection of Essays by =W. S. Franklin=. 2nd Edn. 5/6 net.

_Electric Waves._ =W. S. Franklin.= 24/- net.

_Lessons in Mechanics_ (1919). =W. S. Franklin= and =B. MacNutt=. 12/- net.

_Lessons in Electricity and Magnetism_ (1919). =W. S. Franklin= and =B. MacNutt=. 12/6 net.

Adjustment of Observations by the Method of Least Squares, 29

Advertising, A Study of a Modern Business Power, 55