. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. According as the station is east or west of Greenwich, the gilt hand must be placed before or after the steel hand. I , Upon this plan, in the case of a clock at the Devonport station, the two hands would be 16 minutes 40 seconds apart; and when the steel bands showed 60 ou the dial, the gilt hand would show 16 minutes 40 seconds past the hour; in like manner, when the gilt band showed 60 minutes the steel hand would show 43 minutes 20 seconds, or wanting 16 minutes 40 second
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. According as the station is east or west of Greenwich, the gilt hand must be placed before or after the steel hand. I , Upon this plan, in the case of a clock at the Devonport station, the two hands would be 16 minutes 40 seconds apart; and when the steel bands showed 60 ou the dial, the gilt hand would show 16 minutes 40 seconds past the hour; in like manner, when the gilt band showed 60 minutes the steel hand would show 43 minutes 20 seconds, or wanting 16 minutes 40 seconds of the hour. By this contrivance the public would imm«- diately understand that the train which was stated in the railway hill to leave at any given hour, really left 16minute« 40 seconds before that time, as showa by the clocks at the place ; the time an- nounced in the printed bill, referring to London, and not to Devonport time. On the other band, suiqiose a country town, Canterbury for example, east of Greenwich. The Cathedral, as shown in the trigonometrical survey, is fast of Greenwich 4 minutes 19 seconds, so in this case the reverse would take place, and the train would take its depar- ture 4 minutes 19 seconds after the time shown by the Canterbury clocks. .•VII railway clocks should be furnished with a seconds hand, which hand should he set to agree with that which shows Greenwich mean time. Thii is an additional reason for employing a seconds pendulum. When clocks are required to be kept to a particular time, fast or slow of Greenwich, which is frequently the case, and that in setting the clock a dif- ference is to he allowed ; there is always some risk of a mistake being made, which is much increased by the very short time that in many cases can be allowed for winding it and, if necessary, setting the clock, and more atten- tion is required than can reasonably be expected from an ordinary clock winder. With the double minuie hand a mistake of this sort cannot
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