Hartung's spring loaded centrifuge

Small example of Hartung's spring loaded centrifugal governor

This governor, which was patented by H. Hartung in Germany in 1893, and is widely used, is of the spring-loaded centrifugal type. The weights are flat but shaped on the rim to suit an external cylindrical casing keyed to the vertical governor spindle. Each weight is supported on the double arm of a bellcrank lever which has its fulcrum in the casing, whilst the other arm is attached by a link to the sliding collar. The weights in all positions thus deviate but slightly from one horizontal plane so that the disturbing effect of gravity is almost eliminated. The weights are loaded by helical springs placed in recesses bored in them and bearing against plugs screwed on a through bolt, thus allowing of adjustment within narrow limits. This linkwork therefore remains unloaded; internal friction is consequently small, which makes the governor sensitive and reduces wear. The governor is so nearly isochronous, that a wide range in the number of revolutions cannot be obtained by altering the tension of the springs. Weights, however, may be placed on the sliding collar or a spring balance may be attached to the linkwork for this purpose; this, however, increases friction and diminishes sensitiveness. The casing acts as a protection against dirt, etc., while the top is easily removable to gain access to the springs.