G - Physics – 01 – B
Patent
G - Physics
01
B
33/49
G01B 9/00 (2006.01) G01B 11/00 (2006.01) G01B 11/26 (2006.01) G01C 15/00 (2006.01)
Patent
CA 1115945
ABSTRACT OF THE DISCLOSURE An optical device for visually determining a specific plane is disclosed. The device may be used for levelling in construction work wherein the plane defined by the device is parallel to the ground plane. The device includes a box in the front side of which is a forward screen and a rear screen behind and angular to the forward screen. There is also a second rear screen which is parallel to the -front screen. The screens have parallel opaque screen lines separated by transparent interspaces such that observation through the screens shows moiré patterns formed by light transmitted through the screens to determine whether an object observed through the screens is above or below the plane. A mirror is located behind the screens in parallel with the forward screen and with a portion of its lower edge at the rearmost lower edge of the rearmost screen, the mirror extends upwards at an angle of 45°, and in the upper surface of the box is an opening extending for the length of the mirror, the opening covered by a transparent material.
313024
Bergkvist Lars A.
Fetherstonhaugh & Co.
LandOfFree
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