AbstractsPhysics

By measuring the intensity of a boron line excited in the presence of different elements it was found that those elements which have tines of just longer wavelength than any boron line arising from the same upper energy level. as the one being measured and which are due to transitions between two excited states, the upper of which is not excited at the voltage being used, lessen the intensity of the boron line. The energy is transferred from the boron atom by collisions between the atoms of the two elements. In an arc the concentration of the dampening eleffient depends upon the volatility of the compound form1in which it is used, and the reduction caused therefor varies from compound to compound. This is not so for the spark. The addition of a third element with a line of just shorter wavelength than both the boron and the dampening line and which is excited at the voltage beine used, lessens the dampening effect.