FOG-SIGNALS. 77'J FOIL. sounds more clearly than the other, md ikiI beard most distinct ly indicat e a oli proximation to the exact direction from which the sound comes. FlQ. i. SIGNAL CODE. Dots denote short blasts, and dashes long Masts. The sound-director consists of eight stationary megaphones, each being directed 1" one of the points of the compass, as shown in the illustra- tion. It is also made of a single automatic re- Vessel hearing signals FlG. 5. RELATION OF SOUND BETWEEN TWO VESSELS. volving megaphone, which emits the appropriate sound on arriving at each point of the compass. Different points of the compass are indicated by a simple code of long and short blasts, the opposite FlG. 6. FOG SIGNAL ON FERRY SLIP. points of the compass being in each case reversed : for example, north is one long blast, south short blast, west is a short blast and a long blast, and east is a long blast and a short blast. Vol. VII. — 50. I mi- pass are indicated on i he accompan Fig. I. I he diagram Fig. relat ion of the sounds as be1 ween '
hen two signs ird « it h ■
both louder i han the fol li one, t be di rectii m of the danger must be mid the point - w hioh am 1 1 ) ■ equal ■ . be placed on lighl I md ferrj , aiding, jii i he latt slip, even in verj l> 'I be ini'i hod adopted for t his purpose i- indii in Fig. 6. These signals tnaj al o be a pplii aid in in. in ling a flei to in i heir relat h e posit ions and to maintain their distance. FO-HI, b.'lir-'. See Fl ff-HI. FOHR, fer. due of the North Frisian Isl- ands, situated in the North Sea, off the western coast of Schleswig (Map: Prussia, C L). about 31 square miles. The surface i- partly elevated and partly marshy, the l g protected by a dike. The soil is productive. The population uumbers about 1000, stly Fris- ians speaking the North Frisian 1 ai The chief occupations are fishing and seafaring. The island contains the town of Wyk. FOIT3LE. Lady Wishfort's intriguing, un- trustworthy maid, in Congreve's Way o) the II orld. She is in Mirabel's pay. FOIGARD, fwa'giir'. Fathek. A pretended French priesl in Farquhar's Beaux' Strata* (170a). He is an Irishman, and is found by his accent . FOIL (OF. foil, fuel, fueill, Fr. ft Ml . lea! from l.at. folium, 6k. iptWov, phyllon, leaf). A term used in architecture in combination with the numerals to indicate the number oi i (q.v.) in mediasval openings or tracery, grouped is to be tangent to a larger are. either ex- pressed or implied; there are (ri oil quatrefoil, cinquefoil, or sexfoil arches, according to the number of foils. The meeting point foils is railed the cusp. Moorish arches have the largest groups of foils; in very late Gothic they are also numerous. In late Romanesque and early Gothic the favorite group i- the trefoil, with round foils in the former and pointed foils in the latter. See ABCH. FOIL. A general name for thin metal inter mediate in thickness between leaf metal, Buch as gold, silver, and copper leaf, and sheet metal. There are two distinct kind-, of foil in common use: The very thiii tinfoil used in chemistry, for electrical apparatus, and formerly for coating the backs of mirrors (q.v.); and the brighter, thicker foils, which, under the name of 'tin-el.' made of copper, tin. tinned copper, or sil- vered Copper, and are lised by jeweler- for theatrical and other ornaments. The foils used by jewelers for backing : Ued Dutch foils, consisting of small sheets of silt copper rolled very thin, are colored with the fol- lowing preparation-, to suit the different ■_ under which they are to be placed, or for usi tinsel in the manufacture of theatrical ornament-. toys, etc.: Lake and Prussian blue, and pale divine-oil finely ground with a slab and mullar—
