01SPIRIT

Hello students, in last lecture we studied about sign bar. Today I am going to discuss about spirit level or say explain working principle of spirit level. Today we will learn about spirit level. Spirit level is Angular displacement is measured by using spirit level. T And except that tube, in the middle there is air flow. So this air flow is Now when the mark on the tube is the angular displacement, w And we can measure the angular displacement. So the level of the spirit is seen in the angular deviation of the horizontal state. So t Now if we take it a little So the spirit level is horizontal and horizontal. It is horizontal and horizontal. Now the level of the spirit level is at the level of the new dimension of the spirit level. So t T Now we know the horizontal difference between the two, w So L is the base length of your spirit level. So we know capital H and capital L. So the displacement that comes in the form of alpha, t So the other side is at the level of the front side, w The other side is at the level of the front side, w And L, w So the 10 alpha, w So the alpha is at the level of the front side and the other side is at the level of the L side. So 10 alpha and alpha is equal to capital H divided by capital L. So now we have the alpha state. We have got H and the value of L is important. So we can easily make the angular displacement of alpha. Now, if we look at the upper part, then when we are at the level of the spirit level, we can easily make the angular displacement of alpha. The upper part of the spirit level is between the two states, w So the difference between the two states is small L and the curvature is between the two states. So the curvature is the radius of the glass tube. So the radius of the glass tube is between the two states. Now, if we look at the center of the top of the spirit level, then we can see the radius of the glass tube. So the same way 10 alpha is equal to the front side and the back side. The front side is small L and the back side is capital R. So 10 alpha is equal to L divided by R. So 10 alpha or angular displacement of alpha is the value of the spirit level. So the spirit level is used to measure angular deviation or angular displacement. Next, we will see the last measuring instr So auto-coliometer is also used to measure angular displacement or angular deviation. So auto-coliometer is an optical angular measuring instr Optical angular measurement means optical energy, w So it is also known as optical angular measuring instr Now, if we measure in some ways, then we see the first step of the top. So that is to leave the light source. The collimeter lens, in the collimeter lens, the light is lit up and then the light is above the top. So the part that we are going to measure is the part above the top. Now, the view in the mirror is the horizontal part, w So the other side is the vertical part, w So the light source that is above the top, it reflects from there. In return, the collimating lens is above and the point passage is above the top. The horizontal part of the top is long, w Now, we have tilted the back of the top a little, we have tilted the alpha angle above the other side of the dotted line. So the light source is in the middle of the collimating lens, w It reflects from there. After that, the light source is near the new position of the dot. And that is the difference between the dot and the dot, w So that is the difference between the dot and the dot, and the small d. And there is angular displacement, w So to measure t We have taken d, from O to O, and the end of O. We have taken f, so f is the O, and the collimating lens is the end of O. We have taken f, and we have taken d, from O to O. So the difference between d and f is the difference between d and f. So we have measured d theta, w So for the angular displacement, or for the nano angular measurement, t If you do a little work piece, and you get angular displacement, then this measuring instr So, autocollimator is used to measure angular displacement, or angular angle measurement. So you can easily measure angular displacement, or angle measurement by autocollimator. So this one is the last instr Then you have to show each and every video lecture of thank you.