公开(公告)号：WO1990013002A1

公开(公告)日：1990-11-01

申请号：PCT/AU1990000141

申请日：1990-04-12

Applicant: KEY, Bruce, George

IPC: G01C05/00

CPC classification number: G01C15/004

Abstract: A device for defining a plane to determine relative elevations comprising in combination a stationary housing (7) having an aperture (8) and locating a pair of vertical reflecting surfaces (6) at right angles to each other which may be a pair of mirrors (5) or a right angle prism (32) and a levelling rod or staff (14) adapted to be positioned at a vewing distance from the housing (7) and incorporating a light source (12) and an eyepiece (15) whereby an observer at the location of the levelling rod (14) can move the light source (12) up and down the levelling rod (14) until a reflection of the light from the light source (12) is seen in the pair of reflecting sufaces (6). A reading can then be taken on the levelling rod (14) at a point midway between the eyepiece (15) and the light source (12) which defines a horizontal line from the reflecting surfaces (6).

公开(公告)号：WO1981002200A1

公开(公告)日：1981-08-06

申请号：PCT/SE1981000018

申请日：1981-01-23

Applicant: STROEM Y

IPC: G01C05/00

CPC classification number: G01C5/00 ,  G01C15/12

Abstract: An instrument for use when levelling and when laying-out right angles comprises upright minors (1) which intersect each other at right angles and are carried on a frame structure (2) that is adjustable relative to the horizontal plane, said minors having markings (4) located on the same level relative to a plane (12) which forms right angles with all minor surfaces, thereby to enable a levelling operation or a laying-out operation to be carried out by a single person.

Abstract translation: 用于平整时和在平直布置时使用的仪器包括直立的相互相交的直立的未成形体（1），并且被承载在相对于水平面可调整的框架结构（2）上，所述未成形体具有标记（ 4）相对于与所有次表面形成直角的平面（12）位于相同的水平面上，从而能够由单个人进行调平操作或布置操作。