Rainbow ruler

Details Rainbow ruler Rainbow ruler

2007-01-03

2008-08-26

Guadalupe-McCall, Yaritza (Department: 2859)

Geometrical instruments

Straightedge type

Rules

C033S491000, C033S679100

Reexamination Certificate

active

07415772

ABSTRACT:
A set of rulers for teaching the concept of measurements includes a first ruler having a first group of incremental division lines corresponding to a first group of measured lengths, each line of the first group having a first length and a first color. A second ruler in the set adds a second group of incremental division lines corresponding to a second group of measured lengths, each line of the second group having a second length and a second color, the second group of lines extending from an distal end portion of the first group where the second group of measured lengths corresponds to the first group. A third ruler of the set adds a third group of incremental lines corresponding to a third group of measured lengths, each line of the third group having a third length and color and, where the third group of measured lengths corresponds to the first and second groups, extends from the distal ends of the second group of lines. A method of using the set of rulers to teach is also disclosed.

REFERENCES:
patent: 4547969 (1985-10-01), Haack
patent: 4614042 (1986-09-01), Maurer
patent: 4750270 (1988-06-01), Kundikoff
patent: 4778390 (1988-10-01), Marans
patent: 5335421 (1994-08-01), Jones, Jr.
patent: 5746001 (1998-05-01), Fisher
patent: 5881469 (1999-03-01), Monck
patent: 6243959 (2001-06-01), Monck
patent: 6813841 (2004-11-01), Ramsey
patent: 7076881 (2006-07-01), Perry

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