Certainly Mersenne had briefed both Huygens and Le Tenneur but it was not until three weeks after Mersenne's death in 1648 that these experiments were carried out.
Totoong Mersenne had briefed parehong Huygens at Le Tenneur ngunit ito ay hindi hanggang tatlong linggo matapos Mersenne ng kamatayan sa 1648 na ang mga eksperimento ay natupad.