Page 1 :
Tabular Column:, , Fc ed, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , | Spherometer reading for Spherometer reading for |, Trial spherical surface, hy in mm ! plane glass surface, hz inmm | fh =h,-h,, =, No. | PSR “oe PSR | nen TR in mm, 1 HSR | j inmm | in mm, inmm in mim ||, te + ~ 4} — uF |, Gee | 3, “ + 1, 2 | ., ee ie: = 3 Z |, i | ee |, Mean sagitta, A= ....-....-.066 i ee a oe, Calculation:, , , , Determination of length / from equilateral triangle ABC:, , ‘AB ee es oct cm, Dips ea Pe cm, (Oe eS ea cm, AB+BC+CA, Mean /= gr aes =, , a - . ., se 7 areca ee 28, , at, , 6), , 7), , 8), , 9), , Watch glass is placed on a plane glass plate so that its convex side faces, , upwards., The spherometer is placed on the spherical surface, so that all the three legs, are on the surface and tip of the screw well above the pole of the surface., , The screw is moved gradually downwards till the tip of the screw just touches, , _ the spherical surface., , The pitch scale reading (PSR) and the number of the corresponding circular, scale division (HSR) in line with the pitch scale is noted., , Total reading is etoaieted using the formula, TR = PSR + (HSR x LC). This, gives hy. :, , The spherometer is transferred on to the plane glass plate, the screw Is mov ed, gradually downwards till the tip of the screw just touches the surface of the, , glass plate., , 10) The pitch scale reading (PSR) and the number of the corresponding circular, , scale division (HSR) in line with the pitch scale is noted., , 11) Total reading is calculated using the formula, TR = PSR + (HSR x LC). This, , gives Ap., , 12) hy - hz =h is found. This gives the value of Sagitta., , 13) The experiment is repeated for two more times by rotating the spherical, , PUPTE, , surface having its center undisturbed, The mean value of h is found.