Abstract: In order to display a digital drawing on a display screen of a terminal device at a scale reduction compliant accurately to actual dimensions, a CPU of a tablet-type terminal device displays drawing data of a digital drawing on a display screen at a predetermined scale reduction. At this time, the CPU references attribute information of the data of the digital drawing, compares it with a display density of the tablet-type terminal device, and displays a design drawing on the display screen at a selected fixed scale reduction. In this configuration, the drawing data at a scale reduction compliant accurately to actual dimensions can be displayed on the display screen of the terminal device. Since the display compliant accurately to the actual dimensions is achieved, a user can measure distances and dimensions by directly using a triangle scale on the display screen.

Abstract: In order to display a digital drawing on a display screen of a terminal device at a scale reduction compliant accurately to actual dimensions, a CPU 52 of a tablet-type terminal device 50 displays drawing data of a digital drawing on a display screen 51 at a predetermined scale reduction. At this time, the CPU 52 references attribute information of the data of the digital drawing, compares it with a display density of the tablet-type terminal device 50, and displays a design drawing on the display screen 51 at a selected fixed scale reduction. In this configuration, the drawing data at a scale reduction compliant accurately to actual dimensions can be displayed on the display screen of the terminal device. Since the display compliant accurately to the actual dimensions is achieved, a user can measure distances and dimensions by directly using a triangle scale 100 on the display screen 51.

Abstract: In a ship-body frictional resistance reducing device, an ejection chamber having an air ejection hole is fixed to a bottom of a ship body, and an air supply path for supplying air to the ejection chamber and a marine-biofouling preventing-fluid supply path for supplying a marine-biofouling preventing fluid to the ejection chamber are connected to the ejection chamber. An on-off valve is provided on each of the paths, by which either one of the paths can be connected in a selective manner, making it possible to prevent adhesion of marine species to the air ejection hole of the ship body while suppressing power consumption therefor.

Abstract: In a ship-body frictional resistance reducing device, an ejection chamber (13a, 13b, 13c, 13d, and 13e) having an air ejection hole (14a, 14b, 14c, 14d, and 14e) is fixed to a bottom (12) of a ship body (11), an air supply path for supplying air to the ejection chamber (13a, 13b, 13c, 13d, and 13e) and a marine-biofouling preventing-fluid supply path for supplying a marine-biofouling preventing fluid to the ejection chamber (13a, 13b, 13c, 13d, and 13e) are connected to the ejection chamber (13a, 13b, 13c, 13d, and 13e), and an on-off valve (23, 34) is provided on each of the paths, by which either one of the paths can be connected in a selective manner, making it possible to prevent adhesion of marine species to the air ejection hole of the ship body while suppressing power consumption therefor.