The magnetic difference is 3 degrees west, and the direction of the water tower measured by the nort

It is recommended to check the magnetic compass map first, due north is 0 degrees, due east is 90 degrees, due south is 180 degrees, due west is 270 degrees, this 120 degrees is southeast and east, since the magnetic declination angle is 3 degrees west, that is, back to 3 degrees to the east, the actual direction is 117 degrees (southeast and east).

Using the triangle similarity theorem, set it to x, x hope it will help you!

Predetermine the blasting direction, and then dig blasting holes on both sides on the center line of the collapse direction, and the opening range should be greater than half of the circumference to ensure smooth collapse.

If it is a concrete building, it is too late to dig a directional window. The rebar in the orientation window is also manually broken. This is to ensure that the dump is carried out in the direction of the collapse in the pre-mitigation dispersion.

If there is a flue, the force of the flue should also be considered, and the flue can be rubberized if necessary.

It's okay to swap the direction with the compass, dude...

First to the red one, then: press-inverse-press-inverse-inverse-press-pass. Probably so.

When laying out, the north arrow is generally laid out with the north arrow facing up, and the declination angle of the north arrow should not be greater than 30 degrees. This is conducive to corresponding, to the topographic map.

Architectural drawing: The building elevation drawing is the positive projection drawing obtained by projecting the different measuring surfaces of the building onto the lead projection surface. The building section is based on the cutting position and projection direction indicated on the building plan, and it is assumed that the tangent plane of the plumb direction is used to cut the building after the orthographic projection drawing is obtained. The floor plan is a horizontal section of the building that is obtained by imagining a horizontal section above the window sill of the house, and then removing the upper part for the orthographic projection of the remaining part.

The construction drawing of the construction project is referred to as the "construction drawing", which is the drawing that represents the overall layout of the project, the external shape, internal layout, structural structure, interior and exterior decoration, material practices, equipment, construction and other requirements of the building.

It is not required, and depends on the layout and layout of the plan.

There will be no requirement to face up.

The compass is secondary.

According to your diagram, how to typeset it, and then add the north arrow, any direction can be, and the diagram corresponds to it.

Yes, but the direction of your drawing design must also change as the direction of the compass changes.

Are you happy to go there? But mark it out. The default is to go up north and down south!!

Depending on the actual orientation of your building, there are no qualitative requirements.

The compass doesn't have to be pointing north, but it must be pointing north! So he can go in other directions

Wooden table without iron screws - red pointing north.

Wooden tables have iron screws — north bias screws.

Iron table....The red end is downward, and it may point north...

1. According to the volume and bottom area, first find the height of the cylindrical water tower.

240÷16 = 15（m）

2. The height of water: 15 4 5 = 12 (m).

240 4 5 16 12 meters.

The water surface is 12 meters high. According to the volume formula of the cylinder.

1. Determine the orientation and calibrate the map.

2. Place it horizontally, so that the pointer can rotate freely, and the direction it points to after it stops is roughly north and south. Combined with the map, you must first clarify your geographical location, and then compare the north direction of the map with the direction of the pointer, and then complete the calibration of the map, that is to say, the map and the field are corresponding.

3. Multi-function compass, it should also be able to measure distance, etc., and the specific function should be read in the manual.

Hope it helps.

First of all, the military uses the north as the reference direction, so the military map and the military compass are all used to use the north as a reference.

Of course, you should only have civilian maps, which are all south to determine the direction, but you can also use it.

First, you place a 1:500m map flat in the north and point it forward, and then point the map and the north arrow at the same time, so that you can determine the bearing.

You're a Type 65 military compass.

Hehe, it's actually quite simple.

You open the map. Place it on the map according to the compass, and the north pointed by the compass is the upper part of the map. Then you can determine your bearings. Then you need to face north, your right hand is east, your left hand is west, and behind you is south!