IN NATURE (vol. xx. p. 103) there appears an abstract of a paper by Prof. E. W. Blake on a machine for drawing compound harmonic curves. Prof. Blake is doubtless not aware that this machine is based ...

Although some users prefer to import graphics and images from other programs into Microsoft PowerPoint presentations, PowerPoint includes an advanced drawing tool that you can use to create a normal, ...

HARMONIC curves possess great importance, since they represent to the eye the circumstances of motion of bodies in a state of vibration, and hence apply not merely to the pendulum and to musical ...