1. A variant of crossed electrophoresis in which the medium contains only one antibody.

Test substances are driven directly into the medium which contains the antibody, forming rocket-shaped (inverted V) trails of precipitation.

2. Electrophoresis in which antigen migrates from a well through agar gel containing antiserum, forming cone-shaped (rocket) precipitin bands.

The area under the cone is used to calculate the amount of antigen.