 I am P. B. Ekhande, working as an assistant professor in Department of Mechanical Engineering at Valgyanstrup Technology, Solapur. So today we are going to observe the procedure for completion of the projections, means either top view or the front view of the plane from the given strike and dip of the plane, so let us consider this problem in which we will be having the triangle which is given in the front view and for this triangle we will be completing the top view with respect to the C edge point. So question is the refer figure and draw the top view of the plane ABC which is having strike as a south-sixty-west and dip angle as a forty degrees and the direction of that is north-westerly or north-west. Now strike which is already known to you that is nothing but the bearing of horizontal line from the plane and dip angle is the angle made by the plane with respect to ground. So that angle is dip angle and dip direction is the direction in which it is having downward inclination. So these are the considerations while completing the view that is in the bottom area that is the top view according to the concept of strike and dip of the plane. Now the first step over here is to complete the line which is given as a strike of the plane with respect to C edge point. Now how much is the strike of the plane that is sixty degrees south towards west. So first we will complete the directions at the location of CF. So four coordinates or that is nothing but the four directions we will be completing with respect to this C edge point. Now the C edge with respect to this upward direction is the north, right direction is east, this direction is west and downward direction is south. Now the south-sixty-west is the strike of the plane. So we will mark the sixty degrees angle with respect to the vertical line. As you know the angle for the strike is always to be indicated with the vertical line that is north, south. So from south towards west the angle is sixty degrees. So at sixty degrees angle we will complete the strike line from C edge. So this line will indicate as a strike line because that is the bearing of the two length line from the plane. Now this line is a strike line to which we must take the plane perpendicular to obtain the edge view. While taking the plane perpendicular it should be taken at slightly larger distance because in this area we will be getting the edge view of the plane, we will be getting the plane projection. Since the A point will be on this projector somewhere here so that is why we will consider the plane at this location so as to get the view properly in the top view region. So for obtaining the edge view of the plane we will be considering the plane perpendicular to strike line or that plane is nothing but the auxiliary plane number one. So that line will complete as a perpendicular line. Now this line we are indicating as a H1 auxiliary plane. So this line is a reference line H1 which is intersection of horizontal plane and auxiliary plane number one. On this projector now we have to mark the distance of C point. So Cf distance will take in compass and this distance will mark on the projector of C to obtain the C1 position. So this point which is nothing but the intersection so this point is a C1 point. That is the point which is obtained by transferring the distance of Cf from this side that is FH plane to the H1 plane side. On this side we are transferring the distance by leaving one view in between the two reference lines. Now with respect to this C1 now we must complete the deep angle 45 degrees. Now this deep angle 45 degrees we can complete with respect to this C1 point and this will complete on this downward direction. So this line is a line which is completed at an angle 45 degrees. So this angle is 45 degrees angle which is deep angle. Now why we have completed the angle on this side? Because deep direction is given over here as a north westerly means north to west the deep direction is there. So this line which we are considering over here is indicating deep direction and with respect to this deep direction we are drawing the plane in this condition because this will have the downward inclination in this direction. When you consider the manned position over here and when you observe the HVO in that case in this direction the plane is dipping towards the ground with respect to this direction. When you consider this direction it is going in the upward direction. When you consider this direction it is going in the upward direction that is why we are not considering this angle this side. Now when you consider the line which is completed with respect to this. Now on this side on this HVO where to mark the positions of A and B, C is already known to us. For that purpose what we will do we will complete the projection of A first. So A is to be taken with respect to that and from that we are going to complete the locus of A. When you consider this point in that case we have to first mark that point on this vertical line and with respect to this when you complete the parallel line that is a locus. So this line is locus of A and it will have the intersection over here. So that indicates the position of A1. Similarly, we can have the position of B that is a B1 by first marking the point on this vertical line projector by taking the distance of Bf. So this Bf distance we will take in the compass and from that Bf we will mark the point somewhere here which is position of B and with respect to B then when we complete we will complete the locus it will have the intersection to the vertical line. So on this vertical line then we will take the intersection and on that intersection we can get the position of B1 point. So what we will do now? We will take the line parallel to this FH line and on this sorry H1 line and on this when you draw the line from the B point this line is locus of B and the intersection which we will obtain on this HV line. So that intersection is nothing but the projection of B point. So this point is a B1 point, so this point is a B1 point which is obtained by considering the distance of B from the front view. So this distance we have taken in compass, first we have marked the distance over here on this vertical line on this projector of C and then we have completed the locus of this to intersect at the B position at this position to obtain the B1. Now this line that is B1 to C1 is HV of the plane. So this is HV of the plane and this HV which already we have drawn at 45 degrees angle that is the dip angle and the dip direction which we have considered over here that is the north west, so north to west the plane should have the downward inclination. So in this direction the plane is having downward inclination which we have observed over here and then we have completed the HV with this direction if you complete the HV in this direction that is the wrong thing. So in this direction the plane will have the upward inclination when you consider the HV which is completed in this direction and when you consider the manned position and in this direction the plane is going in the upward direction. So that is why we must consider the downward position over here, now these points can be obtained by back projecting the points from the A1 and B1 position for obtaining the points in the top view. We will have the back projection from this on this back projection will mark the distance we will draw the projector of A, so that gives us A H point similarly when you consider the projection back projection of B1 we will get the position of B H by drawing the projector of B F, so B F projector the intersection with this back projection will give us position of B H, so these are the points which we have obtained when we connect these points that gives us the top view of the plane. So this is a DC line, so this line is a AB line and this line is a AC line, so this completes the triangle of the plane, so this is top view of the plane, so this is the procedure for obtaining the top view or completion of the projections when the strike and the depth of the plane is given to us, thank you.