45, CORNHILL, E.G., AND 122, REGENT STREET, W., LONDON. 

 APPROXIMATE HEIGHT DUE TO BAROMETRIC PRESSURE. 



557 



The English Standard of Length is the British Imperial Yard, which is the space in- 

 cluded between two points of a certain Metal Bar when at the temperature of 60 Fahrenheit, 

 or 15'5 Cent. A foot, which is the third part of this yard, is the unit generally employed. 



A Metre, the French Standard of Length, is equivalent to the ten-millionth part of the 

 Arc of the Meridian, extending from the Equator to the Pole. 



" The Germans indicate inches by putting two accents after the number ; lines by 

 putting three accents. 27" 3'" 1 85, means 27 inches 3 lines 85 hundredths of a line; more 

 frequently they give the height in lines, and the preceding number bacomes 327"' 85." 

 Kaemtz. 



LIQUID MEASURES. 



Cubic Inches. 

 277-274 

 34-65925 

 1-7329625 



Imperial Gallon . . . . 



Pint 



Ounce 



Cubic Inch in Air, temp. 62 Fahrenheit, 



Barometer at 30 inches 

 Ditto ditto in Vacuo, temp. 62 

 Cubic Foot, in Air, at 62, 62-3206 Ibs. avoirdupois. 



Litre 61-02525 



Decilitre 6*10252 



Grains of 



Dis rilled Water. 



70000 or 10 Ibs. 



8750 



437-5 



252-458 

 252-722 



15432- 

 1543*2 



Diameter of a Cylinder containing a Gallon at one inch in depth, 18'78933 inches. 



A Second of Time is the 86,400th part of a Mean Solar Day of 24 hours, and is used as 

 the unit of Time. 



A Degree of the Equator is 69-1613 miles, or 365,172 feet. 



A Degree of the Meridian is 69-046 miles, or 364,565 feet. 



A League is 3 miles. 



A Fathom used in Sea Sounding is 2 yards, or 6 feet. 



A Cable's Length is 120 fathoms, or 240 yards. 



A Military Pace is 2 feet. 



The Portuguese Mile is 1-2786 English Miles. 



The Legua (Spain) 8,000 Vara, or 22,256 feet, or 4'2152 miles. 



The Swiss Meile is 26.666| Fuss, or 8.548 Yards, or 4'8568 miles. 



The Mil (Sweden and Norway) 6,000 Famn, or 11,690 Yards, or 6'6423 Miles. 



