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This eBook from the Gutenberg Project consists of approximately 124 pages of information about Scientific American Supplement, No. 787, January 31, 1891.
Table of Contents
Section Page

Start of eBook1
THE FRENCH IRONCLAD WAR SHIP COLBERT.1
STEAM ENGINE VALVES.1
FIRING POINTS OF VARIOUS EXPLOSIVES.11
STATION FOR TESTING AGRICULTURAL MACHINES.12
WATER SOFTENING AND PURIFYING APPARATUS.14
THE TRISECTION OF ANY ANGLE.15
TEST CARD HINTS.16
CHARLES GOODYEAR.18
THE ELECTROMAGNET.23
III.23
POSITION AND FORM OF ARMATURE.25
POLE PIECES ON HORSESHOE MAGNETS.25
CONTRAST BETWEEN ELECTROMAGNETS AND PERMANENT MAGNETS.26
ELECTROMAGNETS FOR MAXIMUM TRACTION.27
ELECTROMAGNETS FOR MAXIMUM RANGE OF ATTRACTION.28
ELECTROMAGNETS OF MINIMUM WEIGHT.28
A USEFUL GUIDING PRINCIPLE.28
ELECTROMAGNETS FOR USE WITH ALTERNATING CURRENTS.30
ELECTROMAGNETS FOR QUICKEST ACTION.31
CONNECTING COILS FOR QUICKEST ACTION.34
BATTERY GROUPING FOR QUICKEST ACTION.35
TIME CONSTANTS OF ELECTROMAGNETS.36
ELECTRIC ERYGMASCOPE.39
A NEW ELECTRIC BALLISTIC TARGET.39
THE OUTLOOK FOR APPLIED ENTOMOLOGY.41
PUBLICATION.41
CO-OPERATION.43
THE DEPARTMENT AND THE STATIONS.45
STATUS OF OUR SOCIETY.47
SUGGESTION AND COMMENT.48
CONCLUSION.50
POTASH SALTS.51
EXPERIMENTS.52
THE EXPENSE MARGIN IN LIFE INSURANCE.53
THE FLOOD AT KARLSBAD.60
THEATRICAL WATER PLAYS.61
SCIENCE IN THE THEATER.62
NEWER PHYSIOLOGY AND PATHOLOGY.64
THE COMPOSITION OF KOCH’S LYMPH.72
CAN WE SEPARATE ANIMALS FROM PLANTS?76
THE RECOVERY OF SILVER AND GOLD FROM PLATING AND GILDING SOLUTIONS.81
A NEW CATALOGUE OF VALUABLE PAPERS83
THE SCIENTIFIC AMERICAN83
BUILDING PLANS AND SPECIFICATIONS.84
SCIENTIFIC AMERICAN SUPPLEMENT.84
USEFUL ENGINEERING BOOKS84
PATENTS.85
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