Hide Articles List

38 articles on this Page

Advertising

POPULATION OF THE SOUDAN.…

Advertising

CLIFTON AND THE LAWRENCES.

Advertising

A GRIEVANCE OF BRITISH SHIPOWNERS.…

Advertising

I THE BETTING EVIL.

THEFT OF CANNON. I

AN IMPUDENT THEFT. I

THE BALTIC FLEET TO GO TO…

DIFFERENT VERSIONS OF THE…

INUMERICAL TITLES FOR LINE…

ICAMPAIGN AGAINST THE JEWS.

Ecclesiastical News. I

The Chinese Labour Problem.

Advertising

German Foreign Policy. I

Sir Edward Reed on Radical…

Lord Windsor on Chinese Labour.

Advertising

ThePollard Case—Result.1

DAINTINESS AND DIGESTIBILITY.…

[No title]

ISOAP NOT A MODERN PRODUCTION.

I FOB THOSE DEPRIVED OF SIGHT.

I RATING THE CHRONOMETER AT…

News
Cite
Share

I RATING THE CHRONOMETER AT GREENWICH. I A visitor who should make the attempt to compare a single chronometer with a standard clock would feel very disheartened, says the Leisure Hour, when, after many minutes of comparison, he had got out its error to the nearest second, were he told that it was his duty to compare the entire army, some five hundred or more, here collected, and to do it not to the second but to the nearest tenth of a second. Practice and system make, however, the impossible easy, and one assistant will quietly walk round the room, calling out the error of each chronometer as he passes it, as fast as a second assistant seated at the table can enter it at his dictation in the chronometer ledgers. The second beat of a clock, sympathetic with the solar standard, rings out loud and clear above the insect-like chatter of the ticking of the hundreds of chronometers, and wherever the assistant stands he has but to lift his eyes to see straight before him, if not a complete clock-face, at least a seconds dial, moving in exact accordance with the solar standard. The test to which chronometers are subjected is not merely one of rate, but one of rate under carefully altered conditions. Thus they may be tried with the XII. pointing in succession to the four points of the compass, or, in the case of chronometer watches, they may be laij flat down on the table or hung from the ring or pendant, or with the ring right or left, as it would be likely to be when carried in the waistcoat pocket. But the chief test is the performance of a chronometer when subjected to considerable heat for a long period. This is a matter of very great consequence, since a chronometer travelling from England to India, Australia, or the Cape, would necessarily be sub- jected to vpry different conditions of temperature than it would be exposed to in England. They are, therefore, kept for eight weeks in a closed stove at a temperature of about 85deg. or 90deg. At one time a cold test was also applied, but this has been done away with.

LETTERS LONG DELAYED._.

IARTIFICIAL EYES AND TEETH…

I CURIOUS DERIVATIONS. --

The Far East.

iVo Change In Military Situation.

I AlexeidPs Explanation.

I Fire Rates in Toronto.

I Fatal Fire inGuernsey.

[No title]

I KILLED IN BATTLE,

IStocks.