1. A pneumatic transporter comprising an air pipe with a slit extending lineraly along its full length and having two edge portions facing said slit projecting outward so as to conduct compressed air therethrough; two elongate elastic hollow tube members of polyvinyl chloride tightly abutting on the inner walls of said two projecting edge portions so as to define therebetween a linear contact section extending longitudinally along the central line of said slit of the full length of the air pipe, thereby keeping the interior of the air pipe substantially airtight from the outside; a runner in the air pipe disposed so as to be driven therethrough by compressed air introduced thereinto; an arm connected at one end to the runner and projecting at the other end outside of the air pipe through said substantially airtight contact section so as to travel therethrough jointly with the runner with the interior of the air pipe kept substantially airtight from the outside; and means engageable with said other end of the arm so as to convey an article as the result of the movement of the runner.

6. In a pneumatic transporter which includes an air pipe arrangement with a slit extending lineraly along the full length thereof and having two edge portions with inner walls facing said projecting outward so as to conduct compressed air therethrough; two elongate elastic members tightly abutting on said inner walls so as to define therebetween a linear contact section extending longitudinally along the central line of said slit the full length of the air pipe, thereby keeping the interior of the air pipe substantially airtight from the outside; a runner in the air pipe disposed so as to be driven therethrough by compressed air introduced thereinto; an arm connected at one end to the runner and projecting at the other end outside of the air pipe through said substantially airtight contact section so as to travel therethrough jointly with the runner with the interior of the air pipe kept substantially airtight from the outside; and means engageable with said other end of the arm so as to convey an article as the result of the movement of the runner, the improvement therein wherein said air pipe arrangement comprises a main closed pipe loop provided with a control section connected to supply ducts and discharge ducts of compressed air; at least one supplementary closed loop branched from said main closed loop with said control section used in common; a rail built below each loop in parallel relationship therewith; a carriage provided with wheels permitting its travel on the rail, holding members constituting a first mechanism for detachably hanging an article and a second mechanism for effecting automatic engagement and disengagement between said carriage and the arm of the runner; magnetic means disposed at the prescribed pointS of the loops so as to effect the engagement and disengagement of said second mechanism with said runner arm; detecting means for detecting the position of said runner; loop selecting means for selecting the loop for conveying said carriage including valves, shutters and guide plates provided in the loop; and electrical control means for conveying an article to and from the prescribed position by controlling said magnetic means and said loop selecting means.

7. A pneumatic transporter comprising: a. closed compressed air pipe loops including a main loop provided with a control section connected to compressed air supply ducts and discharge ducts of said compressed air and at least one supplementary loop branched from said main loop with said control section used in common, said air pipe having a slit extending linearly along the full length thereof and having two edge portions facing said slit projecting outward so as to conduct compressed air therethrough and two elongate elastic hollow tubes made of synthetic resin tightly abutting on the inner walls of said two projecting edge portions so as to define therebetween a linear contact section extending longitudinally along the central line of said slit for the full length of the air pipe, thereby keeping the interior of the air pipe substantially airtight from the outside; b. a runner received in the air pipe so as to be driven therethrough by said compressed air introduced thereinto; c. an arm connected at one end to the runner and projecting at the other end outside of the air pipe through said substantially airtight contact section so as to travel therethrough jointly with the runner with the interior of the air pipe kept substantially sealed shut from the outside; d. a rail built below each loop in parallel relationship therewith; e. a carrier provided with wheels permitting travel on the rail, holding members constituting a first mechanism for detachable handing an article and a second mechanism for effecting automatic engagement and disengagement between said carriage and the arm of the runner; f. magnetic means disposed at the prescribed points of the loop so as to effect the engagement and disengagement of said second mechanism with said runner arm; g. detecting means for detecting the position of the runner; h. loop selecting means for selecting the loop of conveying said carriage including valves, shutters and guide plates provided in the loop; and, i. electrical control means for conveying an article to and from the prescribed position by controlling said magnetic means and said loop selecting means.