The present invention provides a method of determining the efficiency of a gun cartridge by determining the water weight volume of the cartridge; determining the bore diameter of the gun barrel; determining the weight of the bullet; and calculating the efficiency rating of the cartridge by multiplying the water weight volume by the bore diameter and dividing by the bullet weight. Each transistor of a first subset of the plurality of transistors to be formed has a width that satisfies a predetermined width constraint and each transistor of a second subset has a width that does not satisfy the constraint. The Event Dispatch Mechanism forwards details of events to the User Applications, according to the criteria selected by the user. This multi-channel implementation approach provides many conversion functions in a single assembly and is easily scaleable and configurable to meet a wide range of system requirements without having to go through new designmanufacturing cycles. A method of guiding energy in a subsurface measuring system is also provided, the method including transmitting an electromagnetic signal into a subsurface medium, modifying the electromagnetic signal using a magnetic field, and then receiving a modified return signal induced from the medium using a receiving member.