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_-_--____-THE CONCILIATION…

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..--THE DISCONTENTED ENGLISH-WOMAN.

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HINTS FOR HEALTH.

♦ WHEN to CLEAN THE TEETH.

INJURIOUS FOOD.

TREATMENT OF EARACHE.

HOW TO MAKE TEA.

LESSONS.

BUSY MR. FROG.

THE FIRST PATIENT OF FLORENCE…

INTERESTING FACTS.

♦ OBVIOUS.

,♦ ROUGH ON HIM.I

♦ THE RAIN-TREE.

♦ A RESOURCEFUL MILKMAN.

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-+--PERFECTLY SAFE.

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• ♦ TO IMPROVE WATER COLOURS…

•♦ COLD WATER ANNEALING.

ELECTRICAL MEASUREMENT OF…

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ELECTRICAL MEASUREMENT OF HEAT AND FLOW. A meter for measuring the rate of now of gas or air, which can be adapted for use as a steam meter "i)r as a steam calorimeter, taking the quality of all the steam passing through a pipe instead of that of a sample of steam, was described recently to a meeting of the American Society of Mechanical Engineers. The opera- tion of the gas-meter depends upon the principle of adding electrically a known quantity of heat to the gas and determining the rate of flow by the rise in temperature of the gas—about 5 degrees Fahrenheit—between inlet and outlet. The meter consists of an electric heater formed of suitable resistance material disposed across the gas passage so as to impart heat at a uniform rate to the gas. The resulting rise of tempera- ture is measured and autographically recorded, by means of two electrical resistance ther- mometers. one on each side of the heater. These consist of resistance wire wound upon metal tubes so placed that all the gas passing through the meter comes in close proximity to the ther- mometers. The adoption of this principle of operation permits the construction of a very accurate and sensitive autographic meter of large capacity containing no moving parts in the gas passage: it is independent of fluctuations in pressure and temperature of the gas. and capable of measuring gas or air at either high or low pressures or temperatures. The electrical energy required is about one kilowatt per 50.000 cubic feet hourly capacity at the pressures ordinarily used in gas mains.

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