from The Century Dictionary and Cyclopedia
- Same as seismographic.
Sorry, no etymologies found.
On all subsequent Apollo lunar missions, the LM would be purposefully impacted into the Moon for seismographical measurements, but not Eagle.
Mr. S----, after a delay of some days, refused absolutely to allow any scientific investigation to be made, a refusal remarkably coincident with the recent refusal of his son, the present proprietor, to allow any similar investigation with seismographical instruments.