Back in 1885 they fixed the problem with two U shaped supports on levers http://www.collection.archivist.info/archive/DJCPD/PD/2001/2001_05_08_Claymills/P1010003.JPG on the lower left you see a shaft beside the rail the crane is on you can see a catch lever that operates the mechanism below the floor which brings up the other U support behind the crane. While it is changing over the trolley supports the shaft.
Almost visible at http://ccgi.archivist.plus.com/php/showresult.php?searchv4page=1&srcdata=title&dir=fgm&file=ph423&subject=488 A box of pictures is awol at the moment when I find it I will scan a better picture I think I have Dave Caroline ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
