This lowering tendency towards the low church pitch, and the final adoption of the latter as a general mean pitch throughout the 18th century, was no doubt influenced by the introduction of the violin, which would not bear the high tension to which the lutes and viols had been strained.
Howles, who, employing a high tension alternating arc, showed that the effectiveness depended upon the temperature.
Lovejoy at Niagara Falls, who passed atmospheric air, or air enriched with oxygen, about a high tension arc made as long as possible; but the company (the Atmospheric Products Company) was a failure.
In the case of high tension voltmeters, the movable plate takes the form of a single plate of paddle shape, and for extra high tensions it may simply be suspended from the end of a balanced arm; or the movable system may take the form of a cylinder which is suspended within, but not touching, another fixed cylinder, the relative position being such that the electric forces draw the suspended cylinder more into the fixed one.
Fessenden, "Compressed Air for Condensers," Electrician, 1905, 55, p. 795; Moscicki, "Construction of High Tension Condensers," L'Eclairage electrique, 1904, 41, p. 14, or Engineering, 1904, p. 865.
