Does anyone have access to British firearms patents (with drawings) between 1846 and 1854 inclusive? I have them from 1855 on (as well as most U.S. and French patents of the 1840-1860 period), but the pre-1855 British patents elude me. Specifically, I'm trying to find out if any enterprising gunmaker patented a breechloader with forward-sliding barrel in the 1846=54 time span.