How does a toggle joint provide mechanical advantage?

[Ali Asadullah]

Please explain in detail about toggle joint, especially about its mechanical advantage.

 

[Ali Asadullah]

We did an experiment in which theoretical value of mechanical advantage was always less than the experimental values. We used the formula MA = D/4l for theoretical measurement of mechanical advantage and MA= Load/effort for experimental value. Can someone explain it because it think experimental values are always less than theoretcal ones.