Click here to download the catalog as a PDF file. To view this site you need Adobe Flash Player and your browser must allow javaScripts. Go here to get the latest Flash Player. Sound & Waves Durable construction withstands student use! AND IMPROVED NEW DESIGN! Originally designed as a musical instrument, the Thunder Drum produces loud rumbling with just a flick of the wrist. Don’t be surprised if the music or drama department wants to borrow it! Rumbling Resonance! You’ll be amazed at the depth of sound that comes from our Big Thunder Drum. Just shake it, and the vibrations in the spring are transmitted through the angled drumhead to produce a thundering rumble that will shake your students in their seats! The thunder resonates long after you stop shaking the drum. P7-3100 Big Thunder Drum $79 NEW! Sound Frequency Tester Accurately measure the dominant frequency of sounds from tuning forks, instruments, singing rods, voices, and more with this economical frequency tester. Large four-place readout displays frequency in Hz or kHz. 256 Hz and 516 Hz tuning forks included. 110 V. P7-7070 Sound Frequency Tester $289 Students generate beautiful standing waves in just seconds. Simple, inexpensive standing wave kits get the entire class in on the act Each kit consists of a motor, AA battery holder, battery, and string. Attached to the motor is a length of dowel. When the motor is activated and hung from the string, a clear standing wave appears! Students simply adjust the length of the string to obtain the standing wave and to change the number of wavelengths. Instructions include qualitative and quantitative experiment ideas. P6-7700 Standing Wave Kit (Class pack of 10) $55 Numerically confirm your lessons on music, harmonics, beats, and the Doppler Effect. Add a quantitative element to your demonstrations of sound. NEW! Sound Generator Resonance experiments like the classic adjustable closed-pipe demo generally require the use of unreliable, difficult-to-use tuning forks. Now, with our battery-operated sound generator, you can demonstrate resonance and other sound phenomena easily and without breaking your budget. The generator produces three different tones (400 Hz, 600 Hz, and 800 Hz), which is plenty for most common needs, and runs on one 9 V battery (not included). P7-7050 Sound Generator $99.95 More convenient and reliable than tuning forks. 26 1-800-367-6695