Farrow's military encyclopedia : a dictionary of military knowledge . sunnyweather, and appears as a brilliant star at a distanceof two miles; while some heliotropes have beenused so powerful as to be visible nearly 80 miles term heliostat, applied by Captain Drummoudto an instrument invented by him for the same pur-pose, more properly belongs to an instrument invent-ed by SGravesande, consisting of an equatorial re-volving on its polar axis, so that the sim, whenonce accurately in the focus of the telescope, con-tinues steadily fixed there. Drunimonds heliostatis chiefly used iu Brita
Farrow's military encyclopedia : a dictionary of military knowledge . sunnyweather, and appears as a brilliant star at a distanceof two miles; while some heliotropes have beenused so powerful as to be visible nearly 80 miles term heliostat, applied by Captain Drummoudto an instrument invented by him for the same pur-pose, more properly belongs to an instrument invent-ed by SGravesande, consisting of an equatorial re-volving on its polar axis, so that the sim, whenonce accurately in the focus of the telescope, con-tinues steadily fixed there. Drunimonds heliostatis chiefly used iu Britain. The drawing shows theinstrument as made by Fauth & Co., United States,for the Coast and Geodetic Survey. The telescopebody is an iron tube ; a wood screw with a joint isattached at the middle, so that the instrument canbe screwed to anv tree or post. See Heliography. HELM. HELMET.—1. In Heraldry, the represen-tation of a helmet over shields or coats of the early simple form known as the Norman,the helmet, at a later period, came to vary in shape. use in Continental Heraldry. A Helmet is neverplaced over the arms of any woman except the Sov-ereign. 3. A covering of metal or leather to protect thehead in warfare. The earlier Greek and Romanhelmets, as shown in many extant sculptures, weresurmounted by plumes, but unlike their modem suc-cessors, did not protect the face. During the Middle
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Keywords: ., bookcentury1800, bookdecade188, booksubjectmilitaryartandscience
