Logan, Brown and Webb designed crowns.

Fig. 14. The 'Logan Crown' was invented by Dr M L Logan and patented in 1885. It became very popular and succeeded all other designs of similar crowns. Fig. 15. The 'Brown Crown' designed by Dr E Farmley Brown. Fig. 16. The 'Webb Crown' most likely first used by Dr M H Webb. Page 8, 'Principles and practice of crowning teeth: a practical, systematic and modern treatise upon the requirements and technique of artificial crown work, including some incidental reference to bridgework' by Hart John Goslee, 1903.