The Bellamy Gardner mask was in use by 1905 and was the first British mask for the open administration of ether. This mask combines the features of the Bellamy Gardner mask with a tower frame designed by Ogston. The Museum's "Penn catalogue", circa 1970, describes this mask: "this followed closely upon Ferguson's lead, but has an enormous amount of "dead-space" contained within the apparatus."Open wire ether mask with inner dome (Bellamy Gardner mask) and outer wire frame tower (Ogston frame).Moulded into connector clip: BRITISH MAKEbellamy gardner, ogston, open ether administration, henry peter penn