A Direct-Capacity Bridge for Vacuum-Tube Measurements

A direct-capacity bridge is described which permits the measurement at a single setting of a capacity associated with other capacities in a system having more than two terminals, such as the grid-plate capacity of a vacuutm tube. Two forms of the bridge are described. By making one connection the standard form of capacity bridge already in use in many laboratories may be converted into a direct-capacity bridge. The recommendation is made that vacuum-tube inter-element capacities be specified as direct capacities. Suggestions are made for other uses of the direct-capacity bridge in the laboratory.