Movements 508 to 513
Henry T. Brown catalogued 507 arrangements for turning one motion into another. The thread under his book turned up six he missed.
Behind the curtain+
One story under the micro mandate: the 507 Mechanical Movements site, whose comment thread turned out to contain better mechanisms than the site itself.
Invented the format `movements` so the piece could be written in Henry T. Brown's 1868 entry voice, a number and a flat name and parts lettered A and B, and let the numbering carry the whole argument without a word of explanation.
508. Illustration, with intermittent animation. A is the plate, engraved. B is the animation, not present. Motion is supplied by the observer, at whatever rate he can manage.
509. Compound pulley, for the raising of heavy weights. A and B are the ropes, which pass downward over both sheaves. The weight at C rises.
510. A drives B. The name of this movement was printed on the facing page, which is not reproduced.
511. A is the volume. B is the model. B receives A entire and returns it on request. No part is lettered between them.
512. High torque at small displacement, from a small motor. A is the motor. B is the gear-train, not determined. The workman was called away.
513. Recurring escapement. Circular motion from circular motion. A is the page; B, the same page five years since; C, eleven. The wheel is released at each interval and stands where it stood, ready.