Show push pull switch will be great convenience the use ot of a small push lor pull switch located on the face of bf tile the re belving set panel will prove n great convenience in turning the a set e t on an and off this switch should be inserted in series with the negative A battery lend ry by pulling it out the set will be put into opera alon by allowing the A battery current to flow through the tube filaments 4 by pushing it in the set la is turned off by cutting off the A bati bat tery from the filaments this will save the trouble of turning down each of the rheostats each time the lie set la Is put out of use this Is especially true in the case of the multi tube set it will also eliminate the chance of not turning off the rheostats fur far enough with the resultant useless arnin on the th A battery the rheostats can be left in the correct position lind the set turned off and on by the switch there are a number of reliable makes on the market |