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"Dioptric Floating Light. Elevation." —The Encyclopedia Britannica, 1910

Dioptric Light

"Dioptric Floating Light. Elevation." —The Encyclopedia Britannica, 1910

"Dioptric Floating Light. Horizontal Section." —The Encyclopedia Britannica, 1910

Dioptric Light

"Dioptric Floating Light. Horizontal Section." —The Encyclopedia Britannica, 1910

"aa is the mast, b tackle hook, c, c brass flanges for fixing parts of lantern together, e and g weather guards, h plate glass front of lantern, i shutter by which lamps are trimmed, k lamps, l silver reflector. Revolving catoptric apparatus was applied to floating lights in England, and M. Letourneau, in 1851, proposed to employ a number of sets of dioptric apparatus in one lantern." —The Encyclopedia Britannica, 1910

Floating Lights

"aa is the mast, b tackle hook, c, c brass flanges for fixing parts of lantern together, e and g weather…

An illustration of log driving, which a mean of transporting timber from the field site to the mill. This method uses the river's current by letting the current move floating tree trunks downstream to sawmills. It was the main transportation method of the early logging industry in Europe and North America.

Log Driving

An illustration of log driving, which a mean of transporting timber from the field site to the mill.…

An illustration of a man laying on a raft floating down a river.

Man on Raft

An illustration of a man laying on a raft floating down a river.

A mill which grounds grain into flour. This flour mill is located on a body of water.

Floating Flour Mill

A mill which grounds grain into flour. This flour mill is located on a body of water.

The violet snail is a floating sea slug. The snail is able to float due to the mucus covered raft that it produces.

Violet Snail

The violet snail is a floating sea slug. The snail is able to float due to the mucus covered raft that…