Thoughts

• Seeking Employment

  Sibgatullah ahamd najar June 14, 2017 at 1:53am

  A prism is a three-dimensional solid with two parallel bases, or faces, that are congruent. The shape of the base determines what type of prism you have, such as a rectangular or triangular prism. Because it is a 3D shape, finding the volume (space inside) of a prism is a common task; however, sometimes you will need to find the height of a prism. Finding the height is possible if you have enough information already given: either the volume, or the surface area and perimeter of the base. The formulas described in these methods can work for prisms with bases of any shape, provided you know the formula for finding the area of that shape
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  Grant Sutherland June 13, 2017 at 6:24pm

  sometimes prisms are offset horizontally from the plumb point. Yet another thing to consider as well as cant of the prism. You really need to look at the problem fundamentally instead of trying to use a generic method that may not work for your specific situation. I use Nikon prisms that are configured 30mm forward of the plumb point in order that I don't have to concern myself with prism constants in the instrument. However, and a big however it is. You need a sighting target to sight to not the centre of the prism as this is not over the plumb point if slightly oriented wrong. Generally the prism arrangement will have a pin-point on the side of its tilting axis. The measure vertically from this to the ground point. The offset from the plumb point at this level to the measurement index point is 33mm, so on a height of prism of say 1600mm, the correction to vertical from slope will be only -0.3mm (negligible)