公开(公告)号：US3712974A

公开(公告)日：1973-01-23

申请号：US3712974D

申请日：1972-01-07

Applicant: MAR COM DEV INC

Inventor： MARTIN J

IPC: G06G1/10 ,  G06G1/02

CPC classification number: G06G1/10

Abstract: DISCLOSED HEREIN IS A METHOD AND APPARATUS FOR THE RAPID ADDITION AND/OR SUBSTRACTION COMPUTATION OF HIGHER ORDER MATHEMATICS. THE METHOD AND APPARATUS ARE PARTICULARLY APPLICABLE FOR ALPHAMERIC MANIPULATIONS, FOR EXAMPLE, FOR THE OPERATIONS OF HEXADECIMAL SUBSTRACTION AND ADDITION.

公开(公告)号：US3556397A

公开(公告)日：1971-01-19

申请号：US3556397D

申请日：1968-12-30

Applicant: DAVID C ANDERSEN

Inventor： ANDERSEN DAVID C

IPC: G06G1/10 ,  G09B23/04 ,  G06G1/00

CPC classification number: G06G1/10

Abstract: A trigonometric calculator with a circular degree scale on a scale member and a cursor member mounted to pivot on the scale member at the center of the degree scale. Coordinate axes with their origin at the center of the scale extend one unit length in each positive and negative direction and are calibrated from zero to one. Hairlines are mounted on the cursor member one unit length from the center of the degree scale for placement parallel the ordinate and abscissa axes. The sine and cosine functions may be directly read from the coordinate axes for any angle indicated by the cursor member on the degree scale. Other scales may be provided on either side of the scale member to indicate other trigonometric information relevant to the indicated angle.

公开(公告)号：US1987536A

公开(公告)日：1935-01-08

申请号：US64279732

申请日：1932-11-15

Applicant: CLARENCE NORRIS

Inventor： CLARENCE NORRIS

IPC: G06G1/10

CPC classification number: G06G1/10

公开(公告)号：US1632505A

公开(公告)日：1927-06-14

申请号：US2348325

申请日：1925-04-16

Applicant: HERMAN RITOW

Inventor： HERMAN RITOW

IPC: G06G1/10

CPC classification number: G06G1/10

公开(公告)号：US1484176A

公开(公告)日：1924-02-19

申请号：US61427523

申请日：1923-01-22

Applicant: HAIMES WILLIAM S

Inventor： HAIMES WILLIAM S

IPC: G06G1/10

CPC classification number: G06G1/10

公开(公告)号：US3747846A

公开(公告)日：1973-07-24

申请号：US3747846D

申请日：1971-07-08

Applicant: LONG W

Inventor： LONG W

IPC: G06G1/10 ,  G06G1/14 ,  G09B19/02 ,  G06G1/08

CPC classification number: G09B19/02 ,  G06G1/10 ,  G06G1/14

Abstract: This invention relates to a circular slide rule which is particularly adapted for facilitating the learning process of addition and/or subtraction by primary grade students. The slide rule includes a bottom disc, a top disc, and a problem indicator, all coaxially mounted for relative rotation. The problem indicator, in a preferred embodiment, defines a window which is adapted to display only a single number from a scale on the bottom disc and a single number from the scale on the top disc. The algebraic sum of the two numbers displayed in the window of the indicator is read off on one of the scales as being the number opposite to an answer mark on the other scale.

Abstract translation: 本发明涉及一种圆形滑动规则，其特别适用于促进小学生的加和减的学习过程。 滑动规则包括底盘，顶盘和问题指示器，全部同轴安装用于相对旋转。 在优选实施例中，问题指示器定义了适于仅从底盘上的刻度显示单个数字的窗口，以及来自顶部盘上的刻度的单个数字。 指示器窗口中显示的两个数字的代数和在其中一个刻度上读取为与其他刻度上的答案相反的数字。

公开(公告)号：US2482591A

公开(公告)日：1949-09-20

申请号：US69548246

申请日：1946-09-07

Applicant: ARTHUR MEYERHOFF

Inventor： ARTHUR MEYERHOFF

IPC: G06G1/10

CPC classification number: G06G1/10

公开(公告)号：US2426362A

公开(公告)日：1947-08-26

申请号：US55885144

申请日：1944-10-16

Applicant: MARSDEN MACDONALD GEORGE

Inventor： MARSDEN MACDONALD GEORGE

IPC: G06G1/10

CPC classification number: G06G1/10

公开(公告)号：US2265372A

公开(公告)日：1941-12-09

申请号：US22349238

申请日：1938-08-06

Applicant: JOHNSON FREDERICK W ,  GOYAN FRANK M

Inventor： JOHNSON FREDERICK W ,  GOYAN FRANK M

IPC: G06G1/10

CPC classification number: G06G1/10

公开(公告)号：US2233073A

公开(公告)日：1941-02-25

申请号：US29441339

申请日：1939-09-12

Applicant: FREDERIC B SCHRAMM

Inventor： BRANN GEORGE E

IPC: G06G1/10

CPC classification number: G06G1/10