Playing With Time - Time Travellers Trilogy, #2

While vacationing on a houseboat situated smack dab in the middle of a dry lake bed, the Stanton kids and their cousins discover a time machine that makes their lives a whole lot more interesting...and without a doubt more dangerous!The Stanton kids once again return to their vacation houseboat. When their old enemy, Mr. Powers, creates a vortex which sends him back in time, the children use their time machine to travel back to 1870, where Mr.
Powers is a wanted bushranger who tries to hold them prisoner. In a race against time itself, they try to outwit him by destroying the vortex and leaving him stranded--this time with no possible way of escaping back to their time!