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A "JUG" IN NAME AND FACT. This city jail-of concrete-at Mansfield, Mo., is, however

seldom used.

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QUICK OIL TESTER A WESTERN firm has recently per

fected a centrifuge for testing oil, which will be of great value to producers as it will determine the proportion of sediment, water and oil within a few asim determine the proportion of minutes instead of the forty-eight hours or so required by the gravity test. The new device may be briefly described as follows: four glass flasks are set in aluminum cases which are adjusted about a vertical shaft in such a manner that they revolve with it, the centrifugal force, causing the flasks to stand out in a horizontal position and rapidly precipitating those elements which are heavier than oil. The improved type is driven by a motor.

This centrifuge is now being modified for the use of mining men for the testing of slimes.

ANALYZES OIL IN MINUTES, Not HOURS.
Motor-driven device supersedes gravity test.

LIFE-SAVING HELMET FOR USE OF CREWS IN

BRITISH SUBMARINES. Escape is made from the sunken vessel-as shown-by

coming up through the conning tower.

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ROLLING DAM IN MEXICO, ONE STEEL CYLINDER LOWERED. THE OTHER RAISED,

DAMS OF STEEL IN the irrigated Laguna district of the

Nazas River valley of Mexico, steel cylinders are being used for dams where the construction of water storage reservoirs and the control of the flood of water in the large irrigation canals are necessary. This type of dam is said to be

specially adapted for use in streams which are given to sudden rises, as the cylinders may be raised and lowered.

The first of these rolling dams, as they are called, to be erected in Mexico was located on the San Marcos plantation, near Torreon. The dam is composed of two cylinders, each sixty feet long and eight feet in diameter. The cylinders form a water-tight reservoir when in place.

A second dam of larger size, the cylinder being ninety feet long and twelve feet in diameter, has been constructed in the same district, at a cost of about $250,000. The cylinders are easily operated by electric power. They are raised or lowered on heavy racks, set in masonry abutments. Each cylinder is operated as an independent dam. The power equipment is placed on a masonry pier in the center of river or canal.

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For Cutting METAL WITH GAS. A fine spray of oxygen cuts like a knife through the

heated substance-an English invention.

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A MODEL TOY MOTOR BOAT AS IT TOOK PART IN A “REGATTA" IN VICTORIA PARK, LONDON,

MOVING TRUNKS BY the steps of the coaches, the other where
ELECTRICITY

the platform is on a level with the track.

Both styles are arranged to be driven NYONE who has watched the bag from either end, thus saving the necessity

· gage men at our railway stations of turning. All the wheels are connected tugging the great truck load of with the steering gear so that the truck trunks about can not help feeling that a partial relief at least from their strenuous labor is due them if some invention will make it possible.

That this feeling has been shared by railroad officials is demonstrated by the development of a motor driven baggage truck shown in the illustration.

Two styles have been designed, one much resembling the flat truck we are accustomed to seeing on station platforms, the other having a drop frame as shown in the picture.

The latter style is for use at stations where the platforms are on a level with

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AN ELECTRIC BAGGAGE TRUCK,

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UNUSUAL TYPE OF BORING MACHINE IN USE IN SOUTH AFRICA. The machine is compact and comparatively small, and yet has tremendous power.

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NEW RADIUM INSTITUTE OF LONDON. This is the world's center of scientific research regarding

Kridskejler

HEILIGTHUM

MONUMENT TO BISMARCK IN THE TOWN OF BISMARCK.
It is the custom in Germany to name small cities

after famous Germans.

the properties of this wonderful mineral.

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