A macron is a mark placed above a long vowel to mark its quantity.

But imagine, if you will, a world where these logistical problems were solved.

In order to proportion the braking force to the weight carried by a wheel - a matter of special importance in the braking of wagons - variable leverage systems are now being introduced in which the end of one axle spring is linked to a control spring in the change-over valve, so automatically varying the leverage exerted by the brake-rod according to whether the wagon is full or empty.

The low-resolution signal from these cameras, a 16-by-16 or 20-by-20 array of “black and white” pixels, was spread over the back or belly of the subject in a grid of either electrical or mechanically vibrating tinglers called tactors.