See also:

• HYSTERESIS (Gr. IQTEprIo-es, from vvrkp€iv, to lag behind)

HYSTERESIS (Gr. IQTEprIo-es, from vvrkp€iv, to lag behind)  , a See also:

• TERM

term added to the vocabulary of See also:

• PHYSICAL

physical See also:

• SCIENCE (Lat. scientia, from scire; to learn, know)

science by J . A . See also:

• EWING
• EWING, ALEXANDER (1814-1873)
• EWING, THOMAS (1789-1871)

Ewing, who defines it as follows: When there are two qualities M and N such that cyclic See also:

• VARIATIONS
• VARIATIONS, CALCULUS
• VARIATIONS, CALCULUS OF

variations of N cause cyclic variations of M, then if the changes of M lag behind those of N, we may say that there is See also:

• HYSTERESIS (Gr. IQTEprIo-es, from vvrkp€iv, to lag behind)

hysteresis in the relation of M to N (Phil . Trans., 1885, 176, p . 524) . The phenomenon is best known in connexion with See also:

• MAGNETISM
• MAGNETISM, TERRESTRIAL

magnetism . If an See also:

• IRON [symbol Fe, atomic weight 55.85 (0=16)]

iron See also:

• BAR
• BAR (0. Fr. barre, Late Lat. barra, origin unknown)
• BAR, CONFEDERATION OF
• BAR, FRANCOIS DE (1538-1606)
• BAR, THE

bar is subjected to a magnetic force which is first gradually increased to a maximum and then gradually diminished, the resulting magnetization of the bar for any given value of the magnetic force will be greater when the force -is decreasing than when it is increasing; the iron always tends to retain the magnetic See also:

• CONDITION (Lat. condicio, from condicere, to agree upon, arrange; not connected with conditio, from condere, conditum, to put together)

condition which it has previously acquired, and changes of its magnetization consequently lag behind changes of the magnetic force . Thus there is hysteresis in the relation of magnetization to magnetic force . In consequence of hysteresis the See also:

• PROCESS

process of magnetizing a piece of iron to a certain intensity and then restoring it to its See also:

• ORIGINAL

original condition, or of effecting a See also:

• DOUBLE
• DOUBLE (from the Mid. Eng. duble, the form which gives the present pronunciation, through the Old Er. duble, from Lat. duplus, twice as much)

double reversal of its magnetization, involves the See also:

• EXPENDITURE

expenditure of See also:

• ENERGY (from the Gr. ivipyela; iv, in, ipyov, work)

energy, which is dissipated as See also:

• HEAT (0. E. haktu, which like " hot," Old Eng. hat, is from the Teutonic type haita, hit, to be hot; cf. Ger. hitze, heiss; Dutch, hitte, heet, &c.)

heat in the iron . See also:

• ELECTRICAL
• ELECTRICAL (or ELECTROSTATIC) MACHINE

Electrical generators and See also:

• TRANSFORMERS

transformers often contain pieces of iron the magnetization of which is reversed many times in a second, and in See also:

• ORDER
• ORDER (through Fr. ordre, for earlier ordene, from Lat. ordo, ordinis, rank, service, arrangement; the ultimate source is generally taken to be the root seen in Lat. oriri, rise, arise, begin; cf. " origin ")
• ORDER, HOLY

order to economize See also:

• POWER [WILLIAM GRATTAN] TYRONE (1797-1841)

power and to avoid undue See also:

• HEATING

heating it is essential that hysteresis should in such cases be as small as possible . Iron and mild steels showing remarkably little hysteresis are now specially manufactured for use in the construction of electrical machinery .