GLO 



GLO 



the latest and best authorities ; and there 

 are likewise inserted all the authentic dis- 

 coveries to the present time. The celes- 

 tial globe contains a description of a com- 

 plete catalogue of stars, clusters, plane- 

 tary, nebula, &c to the amount of nearly 

 6,000, from the observations and commu- 

 nications of Dr. Maskelyne, Dr. Her- 

 schel, Rev. Mr. Wollaston, &c., and in- 

 serted from calculations made by Mr. 

 W. Jones, optician of Holborn, in their 

 exact positions, to the present period. To 

 the prinicipal stars are annexed Bayer's 

 Greek letters of reference ; and the 

 whole are circumscribed by well-design- 

 ed figures of the constellations, faintly 

 engraved. 



The great circles are divided into twen- 

 ty minutes of a degree, and the equinoc- 

 tial in addition into two minutes of time, 

 so that, by estimation, the solution of 

 problems may be obtained to five minutes 

 of a degree, or half a minute of time ; a 

 degree of accuracy sufficiently useful, not 

 only for all the common problems, but 

 most of the trigonometrical ones. 



As the reading off of time is found to 

 be a ready and convenient method by 

 hour circles attached to the meridians, 

 the horary circle has been contrived to 

 admit of being slid away from its pole, 

 upon the exterior edge of the meridian ; 

 this is done by making the extremity of 

 the pole which carries the index of the 

 horary circle moveable, by unscrewing. 

 The horary circle being attached to the 

 meridian barely by springs, when the in- 

 dex is unscrewed, the circle may conse- 

 quently be slid to any part of the meri- 

 dian. This contrivance is necessary only 

 for the circle of the north pole of Messrs. 

 W . and S. Jones's terrestrial globe, who 

 have adopted this circle, and at the 

 south pole of the globes have applied the 

 interior brass index,or circles above men- 

 tioned. 



Plates for the British globes of twelve 

 inches diameter have been reduced and 

 abridged, from the eighteen, inches 

 above mentioned. Plates for globes of 

 nine, twelve, and twenty-one inches di- 

 ameter, have been engraved by Mr. Ca- 

 ry, of the Strand. The stars of the celes- 

 tial globe are not circumscribed with the 

 figures of the constellations. 



GLOBULAR chart, a name given to 

 the representation of the surface, or of 

 some part of the surface of the terrestrial 

 globe upon a plane, wherein the parallels 

 of latitude are circles nearly concentric, 

 the meridian curves bending towards 



the poles, and the nhomb-lines are also 

 curves. 



GLOBULAR sailing. See SAILING. 



GLOBULARIA, in botany, a genus of 

 the Tetrandria Monogynia class and or- 

 der. Natural order of Aggregate. Ly- 

 simachiae, Jussieu. Essential character: 

 calyx common, imbricate ; proper tubu- 

 lar inferior ; corollets the upper lip two- 

 parted ; lower three-parted ; receptacle 

 chaffy. There are eight species. 



GLORIOSA, in botany, a genus of the 

 Hexandria Monogynia class and order. 

 Natural order of Sarmentaceae Lilia, 

 Jussieu. Essential character : corolla 

 six-petalled, waved, reflex; style oblique. 

 There are two species, viz. G. superba, 

 superb lily, and G. simplex. 



GLOSS, in matters of literature, de- 

 notes an exposition or explication of the 

 text of any author, whether in the. same 

 language or any other ; in which sense it 

 differs little from commentary. 



GLOSSOMA, in botany, a genus of 

 the Tetrandria Monogy nia class and or- 

 der. Natural order of Rhamni, Jussieu. 

 Essential character : calyx turbinate fcur- 

 toothed, superior ; corolla four-petalled ; 

 anthers almost united, with a membrana- 

 ceous scale at the end ; stigmas four, 

 drupe. There is only one species, viz. 

 G. guianensis, a native of Guiana, flower- 

 ing in September. Votomita is the ver- 

 nacular name. 



GLOSSOPETALUM, in botany, a ge- 

 nus of the Pentandria Pentagynia class 

 and order. Natural order of Rhamni, Jus- 

 sieu. Essential character : calyx very 

 small, five-toothed ; petals five, with a 

 strap at the tip- of each berry. There 

 are two species, both lofty trees, natives 

 ofiGuiana and Cayenne. 



GLOTTIS, in anatomy, the mouth or 

 aperture of the larynx, through which 

 the air ascends and descends in respiring. 

 It can be dilated or contracted at pleasure, 

 and by the various vibratory motions of 

 which the tones of the voice are modified. 

 The name was applied by the ancients to 

 an additional moveable part of the flute, 

 which they placed between their lips in- 

 performance, and which is supposed to 

 have been similar to our reed. 



GLOW -worm. See LAMPYRIS. 



GLOXINIA, in botany, so called in 

 honour of Ben. Petr. Gloxin, of Colmar, 

 a genus of |the Didynamia Angiospermia 

 class and order. Natural order of Per- 

 sonatse. Campanulaceae, Jussieu. Essen- 

 tial character: calyx superior, five-leaved; 

 cor olla bell^shaped, with the border ob- 



