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WAVES & SOUND, CONTINUEDRipple Tank ApparatusUse a ripple tank to study wave and optics prin-ciples. Molded plastic tank with large viewing area has a plate-glass bottom for distortion-free wave images and angled foam perimeter beaches that reduce unwanted reflections. A 1.5-volt motor on a rippler bar generates straight and circular waves at variable ampli-tudes. Also includes light support rod, view screen, parabolic reflector, barriers, detachable legs with leveling feet and instructions. AP5705 I $401.75Slinky®The original Slinky®—it stretches, snaps back and will actually walk down stairs. Great for wave demonstrations. AP1957 I $9.25Wave DemonstratorMake waves with this 1.8-meter helical spring to demonstrate standing, transverse and longitudinal wave properties. AP9023 I $27.50Tuning ForksFinest quality aluminum alloy tuning forks have exceptional tone duration and superior sound. Each is stamped with frequency of sound and note. Set of four includes 256-C, 320-E, 385-G and 512-C. Set of eight includes the set of four plus the premium 288-D, 341.3-F, 426.7-A and 480-B. Premium tuning forks are available individually. Rubber mallet and tuning fork activator also available.Sympathetic and Differential Tuning Fork SetGet a tuning fork to sing out its note without ever touching it with this high-quality set. Set both forks at the same frequency with the open ends of the resonating boxes facing each other. Excite one fork to instill sympa-thetic resonance and then dampen it. The note on the other fork “rings on.” Explore what happens when two tuning forks sound at different frequencies by using the adjust-able weights on one of the tuning forks.AP5724 I $133.00Dual-Trace, 30-MHz OscilloscopeA large, high-luminance CRT screen makes this dual-trace oscilloscope an excellent choice for student laboratory work. The compact unit is designed for continual student use. Compliant with international standards, its key features include two chan-nels and dual trace, a 6” rectangular CRT with internal graticule, high-sensitivity triggering, 10X sweep magnification, DC up to 30-MHz bandwidth and TV synching separator circuit. AP5616 I $651.20Tuning Forks, Set of 4, Premium AP9032CATALOG NO.DESCRIPTIONPRICE/EACHAP6984Tuning Forks, Set of 4$86.55AP9032Tuning Forks, Set of 4, Premium71.30AP6982Tuning Forks, Set of 848.95AP9242Tuning Forks, Set of 8, Premium39.65AP6422Tuning Fork Activator13.80AP9039Rubber Mallet for Tuning [email protected]