March 9th 1876

The apparatus suggested yesterday was made and tried this afternoon.
A membrane (m) Fig 1 was stretched across the bottom of the box (B). A piece of cork (C) was attached to the centre of the membrane (m) forming a support for the wire W which projected into the water in the glass vessel V. The brass ribbon R was immersed in the water also. Coneections were made as in the diagram (Fig 1).
Upon singing into the box B the pitch of the voice was clearly audible from S - which latter was placed in another room. When Mr. Watson talked into the box - an indistinct mumbling was heard at S. I could hear a confused muttering sound like speech but could not make out the sense. When Mr. Watson counted - I fancied I could perceive the articulations "one, two, three, four, five" - but this may have been fancy - as I knew beforehand what to expect. However that may be I am certain that the inflection of the voice was represented 1'; 2'; 3'; 4'; 5`;.

Noted March 9th by A.G.B.
M.G.H.

Volume 1

9 Mar. 1876

Page 39