Bell was never to have another great inventive success , though his speculations and prototypes anticipated fiber-optic transmission , manned flight , sonar , hydrofoil ships , tetrahedral construction , and montessori education .
According to the conventional view , liquid water has a similar , albeitless rigid , structure , in which extra molecules can pack into some ofthe open gaps in the tetrahedral arrangement .
根据传统观点,液态的水分子也是类似排列,尽管不那么严格,额外的分子会被包进四面体孔隙里。
Inventions photograph by bell collection inventor and early national geographic society president alexander graham bell created this tetrahedral truss kite , designed with three-dimensional triangles that could support considerable weight , in order to study aerodynamic design before attempting to build airplanes .