Apart from its use for [[navigation]] (see John Harrison), synchronization was not important in transportation until the nineteenth century, when the coming of the railways made travel fast enough for the [[difference]]s in local time between adjacent towns to be noticeable (see [1]). | Apart from its use for [[navigation]] (see John Harrison), synchronization was not important in transportation until the nineteenth century, when the coming of the railways made travel fast enough for the [[difference]]s in local time between adjacent towns to be noticeable (see [1]). |