"Have you anything special to do to-night, Ned?" asked Tom Swift, the well-known inventor, as he paused in front of his chum's window, in the Shopton National Bank. "No, nothing in particular," replied the bank clerk, as he stacked up some bundles of bills. "Why do you ask?" "I wanted you to come over to the house for a while." "Going to have a surprise party, or something like that?" "No, only I've got something I'd like to show you." "A new invention?"...