These cookies are absolutely essential for our website to function properly.
We use Google Analytics to measure how you use the website so we can improve it based on user needs.
These cookies may be set by third party websites and do things like measure how you view YouTube videos.
Provisional Specification. Improvements in Aeroplanes or Flying-machines. No. 2421. Date of application, 29th Jan. 1914, Complete specification left, 31st Aug. 1914 - accepted, 6th May 1915. Patent applied for by Charles Horace Watkins of 45 Colum Road, Cardiff. Four pages with two fold out diagrams containing five figures.
