  We experimentally study the jamming of quasi-two-dimensional emulsions. Our
experiments consist of oil-in-water emulsion droplets confined between two
parallel plates. From the droplet outlines, we can determine the forces between
every droplet pair to within 8% over a wide range of area fractions $\phi$. We
study three bidisperse samples that jam at area fractions $\phi_c \approx
0.86$. Our data show that for $\phi > \phi_c$, the contact numbers and pressure
have power-law dependence on $\phi-\phi_c$ in agreement with the critical
scaling found in numerical simulations. Furthermore, we see a link between the
interparticle force law and the exponent for the pressure scaling, supporting
prior computational observations. We also observe linear-like force chains
(chains of large inter-droplet forces) that extend over 10 particle lengths,
and examine the origin of their linearity. We find that the relative
orientation of large force segments are random and that the tendency for force
chains to be linear is not due to correlations in the direction of neighboring
large forces, but instead occurs because the directions are biased towards
being linear to balance the forces on each droplet.
