細節
A vertical illuminator,
by W. Watson & Sons in case; a Cheshire's apertometer by R & J Beck Ltd in case; a Beck apertometer in card case; an apertometer by Ainslie in case with leaflet (photocopy); and a J.E. Barnard-designed compressor in case (5)
by W. Watson & Sons in case; a Cheshire's apertometer by R & J Beck Ltd in case; a Beck apertometer in card case; an apertometer by Ainslie in case with leaflet (photocopy); and a J.E. Barnard-designed compressor in case (5)