Going up…

 作者:宦墚     |      日期:2019-03-07 05:04:16
A bicycle-driven air jack could help lift fallen debris in the aftermath of an earthquake. Most simple pneumatic jacks are pumped by foot, but the person doing the pumping quickly tires. The new jack design lets a person pump for three times longer before they get tired, say the inventors. It has an air pump connected to the rear wheel of a bicycle via a long fan belt,