Part 5 (1/2)

APPARATUS 51

_69 Binding-Post_ Fig 35 The ends of two orthe 3 nuts the bolt will e nu 35]

_Make Additional Notes and Sketches Here_

CHAPTER VI

PERMANENT MAGNETS

_70 Pernets_ may be made in many ways and from many different kinds of steel The steel used for needles, watch and clock springs, files, cutting tools, etc, is generally of good quality, and it is already hard enough to retain netism (See Retentivity in text-book)

APPARATUS 52

_71 Bar Magnet_ A straight -needle For sonet, as we net

APPARATUS 53

_72 Bar Magnet_ A harness-needle, which is thicker and stronger than a sewing-needle, net

APPARATUS 54

_73 Bar Magnet_ For long sli-pins, as they are sometimes called, break off short when bent, butThese slinets are excellent for the study of Consequent Poles (See text-book)

APPARATUS 55

_74 Flexible Bar Magnets_ It is often necessary to have flexible nets so that they may be bent into different shapes These s, as such steel, called spring steel, will straighten out again as soon as the pressure is removed from it

Corset steels, dress steels, hack-saw blades, etc, nets

APPARATUS 56

_75 Strong Bar Magnets_ may be made from flat files The handle end may be broken off so that the two ends of the file shall be nearly alike in size These should be net

APPARATUS 57

_76 Co several thin pieces of steel, and then riveting theether, and pull together To netize several harness-needles, or even sewing-needles, and then bind them into a little bundle with all the N poles at the same end Melted paraffine dropped in between theether