| 摘要 |
<p>Dash pot timer Timer includes a cylindrical glass tube in which travels a piston having a diameter slightly less than that of the interior of the tube. A liquid, gum, grease or cpd. ranging in viscosity from 1000 to over 100 million centistokes, and silicone fluids ranging in viscosity from .65 centistoke to covers the interior surface of the cylinder in which the piston is adapted to travel. The flow ingenerated in the cylinder is predominantly a shear flow with the pressure flow being relatively insignificant. The device operates in the lubrication region whereby relatively small timers are are capable of providing delays up to several seconds or more.</p> |
