A NEW INSTRUMENT.

Southland Times, Issue 21073, 3 May 1930, Page 16

A NEW INSTRUMENT.

PROVES A USEFUL ACCESSORY. A very interesting and useful automobile accessory has recently been placed on the market, which it is claimed, will tell at a glance the speed at which one’s car or truck has been travelling. The device which is called the “Ohmer Recordogrof” is placed on the instrument-board of the car and is driven from the transmission. The information about the vehicle’s operation is recorded on a tape which is divided by means of vertical lines into hourly periods. The hours are again sub-divided into five minute periods. The tape moves at a uniform speed under the marker, and the speed is so regulated that exactly five minutes is required to move the tape from one verticle line to another. The distance travelled is shown by horizontal lines, each line representing onefourth of a mile. When the vehicle moves, the marker travels obliquely over the tape, and when the pencil line extends from the bottom to the top, or from the top to the bottom of the tape, a total distance of two miles has been covered. The pencil lines are oblique when the vehicle is moving and horizontal when it is standing still. Thus a horizontal line denotes that the vehicle remains stationary five minutes for each square through which it travels. This instrument should prove invaluable to motorists and especially to truck owners, who can by its aid better determine operating costs.