| 摘要 |
There is disclosed a calculating and recording device of the slide rule type for determining and retaining play statistics of a football game. The device has a body bearing at least one, and preferably two, coextensive grooves, each of which can receive a slide which is calibrated in indicia of arithmetic progression coextensive with the length of the slide. The rule includes removable marker means each bearing an indicium of a single class of a plurality of distinct classes of indicia representing plays or types of plays of a football game and the body of the rule has at least three parallel rows of receiver means in arithmetic spacing equal to the spacing of the indicia of the slide which receive the removable marker means to record passing, rushing and first down statistical information. In the preferred embodiment, the marker means comprise a plurality of varied color, shape or size of pegs and/or cooperative rings, each of which represents a certain type of passing, rushing or kicking play, first down or other statistic, and the like and the rule is provided with sufficient receiver means to record substantially all of the plays made by a team in a single quarter or half of the football game. The preferred embodiment also employs receiver means for locating removable marker means in the groove which receives the slide, thereby permitting markers to be placed indicating how each drive ends and providing a reference stop for the slide and permitting its use for indicating the number of plays in the present drive. The marker means also permits identification of each play in a series of plays such as first, second third or fourth down play.
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