The pull recorded on the diagram includes the resistances due to acceleration and to the gradient on which the train is moving.
The acceleration therefore remains the same, and the velocity is unaltered.
Since the difference between the acceleration of gravity at the pole and at the equator is about 2%, the correction for latitude will be quite sensible in an instrument which might be used at various times in high and low latitudes.
The acceleration of a falling body is naturally attributed to the presence of the earth; and, though the body approaches the earth in the course of its fall, it is easily recognized that the conditions under which it moves are only very slightly affected by this approach.
By using a formula that takes into account the acceleration of gravity, you calculate the time it takes for an object to fall to the ground.