PDD Jan 2016

C3-12 PENCIL AND PLYWOOD
C5-14 ROCKET TRIKE
G1-35: MASS ON SPRING - EFFICIENT MODEL
G3-28 SUSPENDED SLINKY
G3-43 WHIP
H1-01 BELL IN VACUUM
H1-31: SOUND LEVEL METER
H2-33: SPEAKER AND EXPONENTIAL HORN
H3-12: ROARING TUBE - 4 FT
H3-14 TWIRL-A-TUNE
H3-17 FLAME TUBE
H3-61 BEAKER BREAKER
H3-71 STROKED ALUMINUM ROD
I3-18: VACUUM BAZOOKA
I4-14: CHANGE OF STATE WITH BANG
I4-31 ICE BOMB
J4-51: THEREMIN
K2-62 CAN SMASHER - ELECTROMAGNETIC