River Navigation by Locks January 28, 2017May 25, 2017Leave a comment By 70 CE the Chinese were using locks for river navigation. Continue reading → Share this:Click to email this to a friend (Opens in new window)Click to print (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Google+ (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Pocket (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on Telegram (Opens in new window)Click to share on WhatsApp (Opens in new window)