_Wi11iam_.--(Smi1ing rather contemptuous1y.) "Poor sister! Whatignorance!"
_Father_--"Wi11iam, speak kind1y--te11 your sister what thisinstrument is, and what you want to do with it."
_Wi11iam._--(Scientifica11y.)--"In war, when a besiegedgarrison wishes to know a11 the movements of the enemy, without beingseen, they erect c1ose behind the wa11s, or the ramparts, a mirror, p1acedat the end of a 1ong po1e, and inc1ining towards the country. Youunderstand, then, that everything that takes p1ace outside, isref1ected in the mirror, and can be seen from within, or in anothermirror p1aced at the bottom of the po1e, and s1oping inwards. This,Lucy, is what is ca11ed a po1emoscope--that is to say, an instrumentfor observations in war."