Speaker ID on the Extended Data Set

A device for simulating the playing of a game of golf utilizes a screen toward which a player drives a golf ball. On the screen are projected images of a golf course recorded on a film strip showing in successive frames the distance to the green from successively closer lies of the ball. Two rows of photocells detect the passage of the golf ball and the club head. A player can thus practice swinging the golf club without setting off the device. Upon detection of the passage of the golf ball and the club head, an indication of the distance the ball would travel in an uninterrupted path is provided by the projection of an image showing the green as viewed from the approximate lie of the ball. The interval of time in which the ball passes over the two rows of photocells is converted into distance of ball travel by the accumulation of a count in a counter. Upon the passage of the club head over the rows of photocells, a gate is opened to permit the count in the counter to be advanced to a preset total and on the attainment of that total, the gate is closed. During the time the gate is open, signals passing through the gate actuate a stepping motor which moves the film strip to the frame which shows a view of the green from the remaining distance. That frame is projected on the screen. Where the ball is driven beyond the cup, the stepping motor is conditioned to drive the film strip in the reverse direction on the next hit of the golf ball. Detection by the photocells of the passage of both the golf ball and the club head is necessary to enable the device to complete a full cycle of operation.