The improvements which the youngster suggested were so valuable that they were soon being made under his direction, and ere long he installed in the Boston exchange the first multiple switchboard, the fundamental features of which are in the switchboards of to-day.

The brain is the center where such transformations are made, being a sort of central switchboard which permits the sense-organs to come into communication with muscles.

This shows a small section of a complicated telephone switchboard.

As Mr. Carty himself puts it: The little switchboards of that day were a good deal like the automobiles of some years agoone was likely to spend more time under the switchboard than, sitting at it!

We came upon twelve soldier-operators sitting before portable switchboards with metal transmitters clamped upon their heads, giving and taking messages to and from all the corners and crannies of the mid-battle-front.

Most of the large switchboards of that time were installed under his direction, and they were better switchboards than had ever been known before.