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heat of combustion

(Encyclopedia)heat of combustion, heat released during combustion. In particular, it is the amount of heat released when a given amount (usually 1 mole) of a combustible pure substance is burned to form incombustib...

Heliodorus of Emesa

(Encyclopedia)Heliodorus of Emesa ĕmˈəsə [key], fl. 3d cent., Syrian Greek writer. He wrote the romance Aethiopica, one of the oldest and best of surviving Greek romances. Little is known of his life except tha...

Hermas, Shepherd of

(Encyclopedia)Hermas, Shepherd of herˈməs [key], Christian apocalyptic work, composed in Rome c.a.d. 139–a.d. 155. It is a collection of revelations given to Hermas, a devout Christian, by an angel (Shepherd) a...

Heron of Alexandria

(Encyclopedia)Heron of Alexandria hērˈŏn [key] or Hero, mathematician and inventor. The dates of his birth and death are unknown; conjecture places them between the 2d cent. b.c. and the 3d cent. a.d. He is beli...

Hesse, Philip of

(Encyclopedia)Hesse, Philip of: see Philip of Hesse. ...

Hesychius of Alexandria

(Encyclopedia)Hesychius of Alexandria hēsĭkˈēəs [key], fl. 5th cent.?, Alexandrian grammarian. Hesychius is known as the compiler of an invaluable lexicon, a glossary of unusual words and expressions occurring...

Anthemius of Tralles

(Encyclopedia)Anthemius of Tralles ănthēˈmēəs, trălˈēz [key], fl. 6th cent., Greek architect, engineer, and mathematician. By order of Emperor Justinian and with the aid of Isidorus of Miletus, he built (53...

Holland, Parts of

(Encyclopedia)Holland, Parts of: see Lincolnshire. ...

Hales, Alexander of

(Encyclopedia)Hales, Alexander of: see Alexander of Hales. ...

Hanover, house of

(Encyclopedia)Hanover, house of, ruling dynasty of Hanover (see Hanover, province), which was descended from the Guelphs and which in 1714 acceded to the British throne in the person of George I. George was the gra...