My favorite “big happys” are traditional religious festivals, which can’t be beat for color, intensity and otherness. Guide to world’s best festivalsĪll the world is a party you just have to know where to look. Sign up here to get Tools for Possibilities a week early in your inbox. The tools might be outdated or obsolete, but the possibilities they inspire are new. Once a week we’ll send out a page from Cool Tools: A Catalog of Possibilities. (This is a Cool Tools Favorite from 2009 - editors)

The shift valve moves back, and the low-gear piston engages low gear while the high-gear piston disengages high gear. the screw is set at an angle so the the jaws open as they withdraw into the chuck, and close to grip the drill bit as they protrude from the chuck.Ĭhanging Down: As the governor rotates more slowly or the accelerator pedal is pressed, the throttle valve pressure exceeds the governor pressure. The key pinion is turned to rotate the collar of the chuck, which turns the screw inside the chuck to move the jaws in or out. A compact arrangement of bevel gears and levers does the trick. The chuck of a power drill has to grip very strongly as it rotates the drill, yet it must be possible to loosen or tighten the chuck by hand. The feed-dog rises and moves forward between stitches to shift the fabric and then dips and moves back. Both are powered by a wheel driven by the electric motor, synchronizing their movements. One train of cams and cranks moves the feed-dog forward and backward, while the other makes it rise and fall. The Feed-Dog: This moves the fabric forward. The signals from the wheels give the changes in the mouse's position. As the wheel turns, light shines through the slots and produces an electric signal in the photodiodes.

Each wheel has one or two pairs of light-emitting diodes and photodiodes. The mouse rolls on a ball that turns two slotted wheels mounted at right angles.

The new way things work book