Consequently its length is only nine hundred and seventy three miles at present. That is an average of a trifle over one mile and a third per year. There is something fascinating about science. One gets such wholesale returns of conjecture out of such a trifling investment of fact. Experimenters have to use their hands, too.
Theorists are thinkers, experimenters are craftsmen.
The theorist needs no accomplice. The experimenter has to muster graduate students, cajole machinists, flatter lab assistants. The theorist operates in a pristine place free of noise, of vibration, of dirt. The experimenter develops an intimacy with matter as a sculptor does with clay, battling it, shaping it, and engaging it. The theorist invents his companions, as a naive Romeo imagined his ideal Juliet.