Figure 1 from Anton Schwarzkopf's patent for the Shuttle Loop roller coaster (patent US4165695, "Amusement ride with vertical track loop"). The image shows the overall layout of the ride.
Anton Schwarzkoph
1978-01-24
<a rel="nofollow" class="external free" href="https://worldwide.espacenet.com/publicationDetails/biblio?CC=US&amp;NR=4165695&amp;KC=&amp;FT=E">https://worldwide.espacenet.com/publicationDetails/biblio?CC=US&amp;NR=4165695&amp;KC=&amp;FT=E</a>