All About Inventions and Discoveries
The Romance of modern scientific and mechanical Achievements

146 All About Inventions the task upon which he was then engaged was finished. Watson afterwards built two sets of the harmonic telegraph for Bell, comprising three transmitters of different pitches, three receivers with springs tuned to the same pitches, three signalling keys, and a galvanic battery. One installation was placed in one room and the other set in another room at Williams’s workshops. While these preparations were under way the two men came closer and closer together. At night time, when his daily task was ended, Watson would spend his evenings with Bell in the cellar at the Sanders’ home, and in this manner there began that close association which has never been com- pletely broken, and which for many years was extremely intimate. It was the afternoon of June 2, 1875. Bell was sitting in one of the rooms in the Williams establish- ment in which his transmitting apparatus had been set up, while Watson was in the other room. Ex- periments were in active progress over the single wire which connected the two rooms. The day was hot and the weather sultry, and even the springs of Watson’s instruments apparently had become in- fected with climatic lethargy. The spring would persist in sticking to the pole of its magnet through magnetisation. Watson repeatedly knocked the spring free, but the persistence in sticking became exasperating. At last, in sheer disgust and when the spring had adhered with unusual tightness, he gave it some particularly vicious snaps to induce it to vibrate freely, accompanying the action with some decidedly uncomplimentary remarks.