Teaching aid for science study

摘要

Topic After locking the launcher on the installation aspect, the teaching aid for science study whose it is possible to make the adjustment of the direction which can send the winch in easy is offered.SolutionsTeaching aid 100 for this science study, winch the launcher is provided on back of the 10 which installs 20 and winch 20 and the launcher and 10 launcher 10 has with the suction cup 40 which time motion possibly is locked vis-a-vis the installation aspect. Choice figure Drawing 1