I keep buying this book. I keep it at my desk and give it away every year or so to young engineers anxious to reinvent mechanical solutions. Here is fodder for the seeking mind.<br><br>I've consulted these old designs for over 50 years to consider solutions. The trained eye, personal experience and the need to bring solve mechanical problems make these old books relevant. Some solutions are elegant, some are fraught with inefficiency that make them their own sort of application curious, all of the designs have worked for their purpose to make the collection.<br><br>The visual enjoyment and puzzle aspect to visualize just how these solutions work make them fun. No need to reinvent the variable transverse drive.