Contents

pp ix-xv

PART I - ON THE PRINCIPLES AFFECTING THE CAPACITY AND RETENTIVENESS OF STEEL FOR THE MAGNETIC CONDITION; WITH THE DEVELOPMENT OF PROCESSES FOR DETERMINING THE QUALITY AND DEGREE OF HARDNESS OF STEEL

CHAPTER I - INTRODUCTORY OBSERVATIONS

pp 1-9

CHAPTER II - DESCRIPTION OF READY AND EFFECTIVE PROCESSES FOR MAGNETIZING LARGE BARS AND THIN PLATES

pp 10-16

CHAPTER III - THE READY DETERMINATION OF THE PROPORTIONAL DIRECTIVE POWERS OF MAGNETIC NEEDLES OR BARS

pp 17-34

CHAPTER IV - THE DETERMINATION OF THE RELATIVE STRENGTH, OR TENACIOUSNESS OF THE MAGNETIC CONDITION, IN EACH OF A SERIES OF APPARENTLY SIMILAR PLATES OR BARS OF STEEL

pp 35-46

CHAPTER V - THE DETERMINATION OF THE RATIO OF THE POWER OF MAGNETS, WITH THE AUGMENTATION OF THE THICKNESS OR MASS, IN OTHERWISE SIMILAR BARS; WITH THE MODIFICATIONS OF SUCH RATIO BY DIFFERENCE OF TEMPERING

pp 47-64

CHAPTER VI - THE DETERMINATION OF THE RELATIVE DEGREE OF HARDNESS OR TEMPER, OF PLATES OR BARS COMPOSED OF THE SAME KIND OF STEEL

pp 65-73

CHAPTER VII - THE DETERMINATION OF THE QUALITY OF BARS, PLATES, OR INSTRUMENTS CONSTRUCTED OF STEEL

pp 74-87

CHAPTER VIII - INFERENCES, FROM THESE INVESTIGATIONS, CONCERNING THE PHENOMENA OF MAGNETISM IN STEEL, AND ON THE APPLICABILITY OF THE RESULTS TO THE IMPROVEMENT OF MAGNETICAL INSTRUMENTS

pp 88-96

PART II - INVESTIGATIONS CONCERNING THE LAWS OR PRINCIPLES AFFECTING THE POWER OF MAGNETIC STEEL PLATES OR BARS IN COMBINATION

CHAPTER I - AS TO THE POWERS OF COMBINATIONS OF MAGNETIZED PLATES OF TEMPERED STEEL, IN CONTACT

pp 97-118

CHAPTER II - ON THE POWERS OF COMBINATIONS OF MAGNETIZED STEEL PLATES, SEPARATED BY LIMITED SPACES

pp 119-131

CHAPTER III - ON THE RELATIVE POWERS OF COMBINATIONS OF MAGNETIZED STEEL PLATES OR BARS, AS AFFECTED BY DIFFERENCES IN THE DEGREE OF HARDNESS OF NATURE OF THE TEMPER

pp 132-184

CHAPTER IV - ON THE RELATIVE POWERS IN COMBINATION, AND SEPARATELY, OF HARD PLATES OR BARS OF STEEL OF DIFFERENT DENOMINATIONS AND QUALITIES

pp 185-201

CHAPTER V - OF THE MAGNETICAL POWERS OF STEEL PLATES OF DIFFERENT MASSES, DENOMINATIONS, AND QUALITIES, AND MEASURES OF COMBINATION, PREPARED FOR THE NEEDLES OF SEA-COMPASSES — WITH THE EFFECT OF SPACING THE PLATES

pp 202-213

CHAPTER VI - ON THE EFFECTS OF THE ANNEALING OF HARD STEEL PLATES OF DIFFERENT KINDS AND MASSES, ON THEIR MAGNETICAL QUALITIES, BOTH SINGLY AND IN PAIRS

pp 214-282

CHAPTER VII - ON THE POWERS OF HARD STEEL BARS COMBINED IN VARIOUS WAYS, AS ALSO IN PROPORTIONAL MASSES, SO AS TO FORM COMPOUND MAGNETS OF LARGE DIMENSIONS AND OF GREATER LENGTHS THAN THOSE OF THE ORIGINAL ELEMENTARY BARS; WITH A PRELIMINARY INVESTIGATION CONCERNING THE METHODS OF DETERMINING THE RELATIVE POWERS OF MAGNETS OF DIFFERENT LENGTHS

pp 283-329

CHAPTER VIII - OF THE MAGNETICAL POWERS, RECEPTIVE AND PERMANENT, OF CAST IRON, BOTH IN SEPARATE BARS OF PLATES, AND IN VARIOUS COMBINATIONS OF PLATES

pp 330-347

CHAPTER IX - ON THE MEASURE OF PERMANENCY OF THE ENERGY IN STRAIGHT-BAR MAGNETS, BOTH SINGLE AND COMPOUND, AND OF DIFFERENT DEGREES OF HARDNESS, AS SELF-SUSTAINED, OR AS INFLUENCED ONLY BY TERRESTRIAL MAGNETISM

pp 348-364