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posed to be the ten millionth part of the quadrant ofthe meridian 39.3708 inches. The ratio to the impe-rial measure of three feet as 1.09363 to 1 ; the log-arithm 0.0388717.

The five following standards have been measuredas follows :

Inches.

General Lambton’s scale, used in thetrigonometrical survey of India

Sir George Shuckburgh’s scale (whichfor all purposes may be considered as iden-tical with the imperial standard)

Gen. Roy’s scale -Royal Society standard -Ramsden’s bar -

35.99934

35.99998

36.00088

36.00135

36.00249

Logarithm.

Weight of a cubic inch of distilled waterin a vacuum at the temperature 62°, asopposed to weights in a vacuum also,

252.722 grains

. 2.4026430

Consequently a cubic foot 62.3862 p.avoirdupois .... 1.7950887

Weight of a cubic inch of distilled waterin air at 62° of temperature, with a meanheight of the barometer, 252.456 grs. - 2.4021857Consequently a cubic foot, 62.3206 p.avoirdupois - 1.7946314

And an ounce of water, 1.73298 cubicinches ..... 0.2387924Cubic inches in the imperial gallon,

277.276 - - - 2.4429124

Diameter of the cylinder containinggallon at one inch high, 18.78933

1.2739112