A wall-drawing hovering device (WDHD) is provided. The WDHD comprises an unmanned helicopter configured and operable for flying and hovering while being disconnected from ground. The WDHD further comprises a mobilizing system comprising at least one motorized wheel. The mobilizing system is physically associated and carried with the unmanned helicopter and configured to drive the WDHD along a vertical surface when the WDHD hovers above ground. The WDHD further comprises a drawing system comprising a paint releasing member connected with a paint reservoir. The drawing system is carried with the unmanned helicopter and configured to controllably release paint from the paint reservoir through the paint releasing member. The WDHD is thereby configured to hover above ground next to a vertical surface such as a wall, so that the mobilizing system frictionally attaches to the vertical surface thereby enabling driving the WDHD along the vertical surface. The WDHD is further configured to draw on the vertical surface by controllably releasing paint from the paint releasing member.

A wall-drawing hovering device (WDHD) is provided. The WDHD comprises an unmanned helicopter configured and operable for flying and hovering while being disconnected from ground. The WDHD further comprises a mobilizing system comprising at least one motorized wheel. The mobilizing system is physically associated and carried with the unmanned helicopter and configured to drive the WDHD along a vertical surface when the WDHD hovers above ground. The WDHD further comprises a drawing system comprising a paint releasing member connected with a paint reservoir. The drawing system is carried with the unmanned helicopter and configured to controllably release paint from the paint reservoir through the paint releasing member. The WDHD is thereby configured to hover above ground next to a vertical surface such as a wall, so that the mobilizing system frictionally attaches to the vertical surface thereby enabling driving the WDHD along the vertical surface. The WDHD is further configured to draw on the vertical surface by controllably releasing paint from the paint releasing member.

A drawing apparatus includes a drawing unit, a test-writing portion, and a control unit including a drawing tool identification unit. At least one drawing tool is loaded in the drawing unit and the drawing tool draws on a drawing target and a drawing medium different from the drawing target. A drawing medium is placed on the test-writing portion. The drawing tool identification unit acquires a test target image from an area on the drawing medium drawn with the drawing tool in the test-writing portion, and identifies a type of the drawing tool loaded in the drawing unit on the basis of the test target image.

A drawing apparatus includes a drawing unit, a test-writing portion, and a control unit including a drawing tool identification unit. At least one drawing tool is loaded in the drawing unit and the drawing tool draws on a drawing target and a drawing medium different from the drawing target. A drawing medium is placed on the test-writing portion. The drawing tool identification unit acquires a test target image from an area on the drawing medium drawn with the drawing tool in the test-writing portion, and identifies a type of the drawing tool loaded in the drawing unit on the basis of the test target image.

The present invention pertains generally to marking surfaces by using gravity system and marking object that is being placed in a marking tube and allowing by its gravity to touch the surface, predominantly to mark the surface. The marking tube is adjustable allowing the marking object to touch the surface accordingly; the marking tube is located on a supporting guide. Particularly, the present invention should and/or will be useful for marking any flooring surfaces and/or any other surfaces where applicable.

The present invention pertains generally to marking surfaces by using gravity system and marking object that is being placed in a marking tube and allowing by its gravity to touch the surface, predominantly to mark the surface. The marking tube is adjustable allowing the marking object to touch the surface accordingly; the marking tube is located on a supporting guide. Particularly, the present invention should and/or will be useful for marking any flooring surfaces and/or any other surfaces where applicable.

Multi-part processes and device with elongated flat members for line end-points, which together can divide a straight or curved line of unknown length into specified numbers of equal sub-parts. This invention significantly extends beyond the limited abilities of various devices and construction techniques, including geometric constructions used over millennia, to subdivide a line into equal sub-parts. The length of any straight-line in a plane can be subdivided into any specified positive natural number of equal sub-parts. The length of any 360 or less arc of a circle in a plane and its subtending central angle(s) can be subdivided into any specified positive integer number of equal sub-parts. Each of the four angles formed when two straight-lines intersect in a plane can be subdivided into any specified positive natural number of equal sub-parts. The specified number for subdivision may be any even or odd positive whole number, including a positive prime number. The multi-part processes and device can be used to produce definite specified fractional subdivisions of a line that are not equal sub-parts of the line. They may be applicable to subdividing arcs of constant curvature that are not circular. This invention can be used to avoid the abstractions in reality and illusions created when objects in the three-dimensional real world are represented two-dimensionally in a plane. The same applies to representations in three-dimensional constructions. This application is a continuation of patent application Ser. No. 16/580,542 in which the examiner found in an amended substitute specification that more than one invention had been disclosed.

The present invention relates to a rectangular multifunctional ruler which is used for measuring and design. In particular the ruler of the present invention enables the user to make measurements in different scales thus the ruler is suitable for multi-scale measurements. In addition to that, the ruler of the present invention also enables the user to sketch mathematical models or in general all kinds of shapes in order to form an unlimited number of patterns within a very short amount of time.