https://books.google.com/books?id=teE_AQAAMAAJ&pg=PA77&lpg=PA77&dq=bed-a-crane&source=bl&ots=Qct2ljs2yQ&sig=jcHn0lPItdLvbpIAkc_wuiAG7kc&hl=en&sa=X&ei=b8w9VfWjEvH_sAT--4CQBw&ved=0CG0Q6AEwDQ#v=onepage&q=bed-a-crane&f=false
