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Thin sections of chalk as seen under the microscope.

Sections of Chalk

Thin sections of chalk as seen under the microscope.

"The Danglish apparatus consists of the following parts: 1st, a generator A, in which carbonic acid is evolved from chalk by sulphuric or hydrochloric acid; 2nd, a gas-holder, in which the carbonic acid is stored for use after being purified in passing through water; 3rd, an air pump, for pumping carbonic acid from the gas-holder, and forcing it into the water vessel and mixer; 4th, another air-pump, for withdrawing atmospheric air from the mixer before the aerated water is admitted; 5th, a water vessel B, a strong cylinder of copper capable of withstanding a pressure of 100 lbs on the square inch, and of sufficient size to contain water for a full charge of the mixer; attached to this water vessel there are a gauge-glass C, and a pressure gauge D, for indicating the pressure of gas as it is pumped in; 6th, the mixer E, a globular vessel of cast-iron, capable of bearing high pressure, through the center of which an axle runs, fitted with iron kneating arms extending to the circumference of the vessel." — Encyclopedia Britanica, 1893

Danglish Apparatus

"The Danglish apparatus consists of the following parts: 1st, a generator A, in which carbonic acid…

"Galerites albogalerus, Lam.; U. Chalk, Kent." — Encyclopedia Britannica, 1893

Fossil Echinidea

"Galerites albogalerus, Lam.; U. Chalk, Kent." — Encyclopedia Britannica, 1893

Hand drawing with chalk.

Hand

Hand drawing with chalk.

Plan of the joints in the chalk cliffs of Treport, showing how they influence the process of erosion.

Joints

Plan of the joints in the chalk cliffs of Treport, showing how they influence the process of erosion.

An illustration of two men drawing on the a sidewalk after measuring a distance.

Men Drawing on Sidewalk

An illustration of two men drawing on the a sidewalk after measuring a distance.

"Carbonic acid water, generally spoken of as Sodawater, though it seldom contains any soda. It is prepared on athe large scale by placing whiting, chalk, or carbonate of lime in a lead vessel with water and sulphuric acid, when the sulphuric acid combines with the lime to form stucco or sulphate of lime, and carbonic acid is evolved as gas." — Chambers' Encyclopedia, 1875

Soda Water

"Carbonic acid water, generally spoken of as Sodawater, though it seldom contains any soda. It is prepared…

"Carbonic acid water, generally spoken of as Sodawater, though it seldom contains any soda. It is prepared on athe large scale by placing whiting, chalk, or carbonate of lime in a lead vessel with water and sulphuric acid, when the sulphuric acid combines with the lime to form stucco or sulphate of lime, and carbonic acid is evolved as gas." — Chambers' Encyclopedia, 1875

Soda Water

"Carbonic acid water, generally spoken of as Sodawater, though it seldom contains any soda. It is prepared…

Section of volcanic plug (basalt) in chalk. Coast of Antrim, Ireland.

Volcanic Plug

Section of volcanic plug (basalt) in chalk. Coast of Antrim, Ireland.

An illustration of a young girl wearing a bonnet and a dress writing the word "finish" on a black board.

Young Girl

An illustration of a young girl wearing a bonnet and a dress writing the word "finish" on a black board.