French and British scientists have published reports describing a sudden change in the geomagnetic secular acceleration which took place around 1969. They claimed that this change, called an impulse or jerk, took place in a period of a year or two and that the sources for the jerk were internal. A recent paper by Alldredge questioned their method of analysis and concluded that abrupt changes in the observed field which occur in a year or two do not originate in the core of the earth. This paper questions Alldredge's conclusion and provides further evidence in support of the reports of the French and British investigators. The average centroid of the jerk is found to be 1969.5. Evidence is presented that indicates that the centroid of the jerk differs for the various spherical harmonics so that the centroid of the degree one spherical harmonic is significantly later than the centroids for the next three harmonics. New estimates for the spherical harmonic coefficients for the jerk and the prejerk and postjerk secular acceleration are given. Some possible further investigations are suggested.