1974-07-31
1976-02-03
Wolff, John H.
35 9B, G09B 500
Patent
active
039356507
ABSTRACT:
Scholastic test grading apparatus uses a circular answer sheet having a circular series of angularly-spaced, numbered rows of radially-spaced answer spaces on which the student marks his answers to correspondingly numbered questions by blacking-in selected ones of the answer spaces as with soft pencil lead. The sheet also carries punch locating indicia opposite each number. The answer sheet is graded by pressing it, in a selected orientation, against a printed circuit board which has formed thereon a pattern of electrical gaps corresponding to the correct-answer positions on the answer sheet. The blacked-in pencil lead blacking material in such positions bridges the electrical gaps to close electrical circuits to a circle of lamps, which light up to show both how many and which answers are correct. A question label disk placed in the circle of lamps identifies the questions or groups of questions indicated by the several lamps.
The circular shape and arrangement of the answer sheet permits it to be oriented in numerous angular positions against the printed circuit board, so as to give different correct answer locations for different tests without changing the pattern of gaps on the circuit board. A designated orientation for each test is obtained by punching holes at selected pairs of the punch locating indicia and engaging the holes over fixed locating pins.
The grading apparatus supports the printed circuit board over a pressure pad which may be manually retracted and latched downward to define a slot for insertion of the answer sheet and which, when released, is spring-pressed upward to press the sheet against the circuit board. The circuit board is a plug-in unit which is readily replaceable to change correct-answer patterns.
The electrical answer-indicating circuits each contain a lamp and a resistance, and operates at relatively high voltage, e.g. 100 v., so as to ensure reliable circuit closure by the blacking material in the answer spaces, and such circuits are isolated from line voltage by an isolating transformer.
REFERENCES:
patent: 3209471 (1965-10-01), Brittan
patent: 3407516 (1968-10-01), Blaske, Jr.
patent: 3631611 (1972-01-01), Abell
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