David and Yola Coffeen both have enjoyed academic careers, as planetary astronomer and as linguist/educator. But since 1982 (yes, 1982!) they have been full-time dealers in early scientific and medical instruments, under the name Tesseract. Selling primarily by catalogue (over 100 issued so far) they also have a web presence at http://www.etesseract.com, and can be contacted at firstname.lastname@example.org. Their offerings include globes of all types, plus the surveying and drafting tools used to make maps and charts and globes over the past 500 years.