Richard Nakka's Amateur Rocketry Page on the World Wide Web
Thrustograph components (sled is not visible).
View of the sled and guide rail assembly. The two items just forward of the sled are scales used to calibrate the springs (removed after calibration is completed).
Close-up view of the sled with the motor in position. The motor is held in place with a pair of saddle clamps (not shown).
Detail of the paper feed mechanism inside the paper feed bin (shown with cover removed). The four rings on the roller are made of rubber (toy car tires!).