Comprises of a straight bar put in thespace framed in wager ween twoperpendicular planes speaking to astraight line remaining in the middle of H.P. andV.P. This pole is set slanted to M.P. AndV.P. and furthermore pivoted to the two planes by thin poles. The linesconnecting the pivots speak to plan and rise of thestraight line. Additionally the fundamental bar made of two unit can be madeto tilt about pivots and to lay on H.P. furthermore, V.P. to represent themethod of discovering genuine length of a line by suitableconstruction either on H.P. or then again V.P. Reasonable pivots areprovided between H.P. or on the other hand V.P. with the goal that it can be collapsed and willbe observed to be very smaller for use in a classroom.

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