Visual aid ruler

Details Visual aid ruler Visual aid ruler

1988-08-29

1989-06-27

Grieb, William H.

Education and demonstration

Measurement of length or volume

G09B 1900

Patent

active

048425214

ABSTRACT:
A visual teaching aid adapted for teaching groups of students in a classroom environment how to read rules and understand dimensional relationships. The teaching aid includes a relatively large sized elongated board adapted for horizontal wall mounting. The board has a scale along the length thereof depicting known units of length proportionally larger than the actual units and a selectively positionable pointer carried in depending fashion from a slide track mounted along the top of the board. A draw cord arrangement, which is operable from either end of the board, is adapted for moving the slide in the track to selectively position the pointer at desired locations along the scale.

REFERENCES:
patent: 832871 (1906-10-01), Mitchell
patent: 1621262 (1927-03-01), MacQuarrie
patent: 2191109 (1940-02-01), Kittredge
patent: 2389394 (1945-11-01), Thomas
patent: 3406900 (1968-10-01), Hunt
patent: 3579860 (1971-05-01), Strem

Affiliated with

Also associated with

Rating

Visual aid ruler does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Visual aid ruler, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Visual aid ruler will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-809613