Vernier Microphone Holder for Speed of Sound Apparatus

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To measure the speed of sound in different gases (air, CO2, N2) we use a 1-1/2" PVC tube capped at both ends (slip coupler and slip plug purchased at Lowes) and a Vernier Microphone (connected to LoggerPro) to record the echoes of a sound pulse (clap) to calculate the speed of sound. Knowing the length of tube and the time between peaks in the echoes we can calculate the speed. The cap on the microphone end has a hole for the microphone and a threaded nipple to attach a gas cylinder The cap on the far end (not shown) has a hole in it to allow you to purge the tube an fill with gas. The tube tends to want to roll of the table, so the microphone holder captures the octagonal cap to prevent this. When installing/gluing the cap on be sure to leave a gap so the cap will slide in to the holder.