The Mystery of Monster Mountain by M. V. Carey

Author:M. V. Carey [Carey, M. V.]
Language: eng
Format: epub, mobi
ISBN: 9780590118842
Published: 0101-01-01T00:00:00+00:00

putting together salvaged bits of machinery or electronic equipment and turning out devices which served The Three Investigators well while they worked on many of their cases. The directional signal and emergency alarm was smaller than the walkie-talkies which the boys sometimes used, but it was still effective. Each unit broadcast a signal — a beep — which could be picked up by every other unit, and which got louder and faster the nearer one approached it. Each of the units also had a dial to indicate the direction a beep was coming from.

In addition to being a sending and receiving set for electronic beeps, each unit had a special alarm—a red light which could be activated by voice alone. When one of The Three Investigators was in trouble or wanted the others to come to him, he had only to say

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.