A dielectric ceramic includes crystal grains containing barium titanate as a main component, magnesium, a rare-earth element, and manganese, wherein the crystal grains have a cubic crystal structure; and the dielectric ceramic contains, per mole of barium, 0. The output of the data receiver is provided to a first ripple counter that counts the outputs from the data receiver and provides an output count. Under this condition, spins in the sample are controlled to produce a magnetic resonance force. An energy source 24 may be configured to deliver energy to the starter 20 at a rapid rate during rapid starting of the one of the first and the second aircraft engines 16A, 16B, the rapid rate being higher than a regular rate used during regular starting of the one of the first and the second aircraft engines 16A, 16B. Further, temperature increases due to the heating of the capillaries during operation can be controlled and thereby thermal deterioration of the gel can be prevented.