How to set up multiple WN604 on one network? Is this bridging?

Picture this ... You have a river and on each bank, there is a road network, but they are not directly connected to one another so no traffic can flow - if you need to connect the two networks you build a bridge to link the road networks. Now - let's translate that into two wired networks - with no direct connection between the two, so no data flows - you can connect an access point to each of those wired networks, and build a wireless bridge to link the wired networks. Understand the concept of bridging now? If you configure as bridges and wire back to the same network as you seem to be doing, you will create a network loop which will bring the network down. What you need to do is configure your access points as a normal access point, and set each to a different channel - 1/6/11 (if you use the same channel, they will interfere with one another, and 1, 6 & 11 are the only "non-overlapping" channels) - same SSID, same encryption keys - and wire each access point back to the main network.