A channel list indicates a channel subset of a sequence of candidate channel locations. A first row of blades is electrochemically machined in sequence. The application then loads the application in the web browser and loads the native code module into a secure runtime environment. A method for measuring the optical performance characteristics and dimensions of a lens using the apparatus is also disclosed. The load circuits include service-brake circuits having a compressed-air reservoir, secondary load circuits and a high-pressure circuit, wherein the solenoid valves of the service-brake circuits and the solenoid valves of the secondary load circuits are open in a de-energized normal state and the solenoid valve of the high-pressure circuit is closed in the de-energized normal state.