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LENGTH-TO-WIDTH RATIO [4 records]

Record 1 2024-06-04

English

Subject field(s)
  • Atmospheric Physics
  • Scientific Measurements and Analyses
  • Brush, Prairie and Forest Fires
CONT

Effective wind speed is the combined effect of midflame wind speed and the slope equivalent wind speed in the direction of maximum spread(head fire). Effective wind speed is used in place of midflame wind speed when winds are blowing upslope and to determine size and shape(length-to-width ratio) for those fires.

Key term(s)
  • effective windspeed

French

Domaine(s)
  • Physique de l'atmosphère
  • Mesures et analyse (Sciences)
  • Incendies de végétation
DEF

Somme des vecteurs de la vitesse du vent à découvert à 10 mètres et de la vitesse du vent de pente équivalente.

Spanish

Save record 1

Record 2 2007-01-19

English

Subject field(s)
  • Gemmology
  • Diamond Industry
DEF

[The] relative dimensions and angles of a polished diamond and the relationships between them; these include table size, crown angle, crown height, girdle thickness, pavilion angle, pavilion depth, culet size, girdle outline, length-to-width ratio, and total depth.

CONT

The proportions, the relationship between the various parts of the stone, determine the fire and brilliance of the diamond. If the proportions are not optimal, undesirable visual effects may occur.

CONT

Proportionscope: An optical instrument marketed by the Gemological Institute of America to compare the proportions of a brilliant-cut diamond with those of the Tolkowsky theoretical brilliant cut.

Key term(s)
  • proportion

French

Domaine(s)
  • Gemmologie
  • Industrie diamantaire
DEF

Dimensions considérées par référence à une mesure, une échelle.

CONT

Les proportions ou rapports internes entre les différentes parties du diamant déterminent le feu et la brillance de la pierre. Si les proportions ne sont pas idéales, il peut apparaître des effets visuels indésirables.

CONT

Proportionscope : Instrument d'optique vendu par la Gemological Institute of America et servant à comparer les proportions d'un diamant taillé en brillant avec celles du brillant idéal américain tel que conçu par Marcel Tolkowsky.

Key term(s)
  • proportion

Spanish

Save record 2

Record 3 2004-07-13

English

Subject field(s)
  • Gemmology
  • Diamond Industry
DEF

The comparison of the length and width of the girdle outline on marquise, emerald, pear-shape, and oval cuts, determined by dividing the length by the width.

CONT

Describe a typical polishing sequence for a princess shape :... f) brillianteer the diamond : create the stars : shape of the stars varies depending on the diamond's length-to-width ratio, crown height and table size...

OBS

The width is expressed as 1. Some length-to-width ratios are considered more pleasing than others; these include: marquise, 1.75-2.25:1; oval, 1.33-1.66:1; emerald cut and pear shape, 1.50-1.75:1.

Key term(s)
  • length to width ratio

French

Domaine(s)
  • Gemmologie
  • Industrie diamantaire
DEF

Rapport obtenu en divisant le pourtour du rondiste d'une taille marquise, émeraude, poire ou ovale, par sa largeur.

Spanish

Save record 3

Record 4 2004-07-08

English

Subject field(s)
  • Gemmology
  • Diamond Industry
DEF

The application of crown stars and halves and pavilion halves for which no specific angles or indices can be prescribed due to the variables of the angles, indices and length-to-width ratio of all the main facets.

CONT

Describe the indices of a princess shape: ... b) for the crown: ... 8 stars: variable, cut to fit ...

French

Domaine(s)
  • Gemmologie
  • Industrie diamantaire
CONT

[Les facettes] sont taillées en alignement par rapport au rondiste à la même profondeur que les excédents.

Spanish

Save record 4

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