Tuomas "Tommo" Vohlonen (24 September 1877 – 27 March 1939) was a Finnish inventor. A surveyor by trade, his patents cover a wide area of devices and activities including compasses, skis, surveying, engines and farming. He founded the company Suunto Oy which is still active producing compasses according to his patented method as well as dive computers, sport watches and heart-rate monitors. In April 1933, after experimentation with various designs, Vohlonen applied for a patent from the Finnish Patent and Registration Office for a compact liquid-filled field compass, in which the magnetic needle and damping fluid were completely sealed into a unitary fused celluloid capsule. Vohlonen was granted a patent on 25 January 1935. Together with his wife Elli and nephew Kauko he founded Suunto Oy in 1936. Vohlonen incorporated his new liquid-filled capsule into a lightweight wrist-mounted design, the Suunto M-311, suitable for use by soldiers, surveyors, hikers, and others navigating while afoot. Early life In September 1877 Juho and Helena Vohlonen had a son in Vohloja ranch, Orimattila. Later they had four more children, sons Kelpo Hyvä (surveyor, wrestler) and Oiva Lahja (officer) and daughters Sievä Maria a.k.a. Maija (agronomist, sheep specialist, author) and Oma Eeva (agronomist), but this son was nominated Tuomas, with only one first name. Parents called him Tommo, and that nomination was used through his life. Only a few years before his death Tuomas could be seen in official patent papers. During the siblings’ childhood the family moved to Lappeenranta for a short while, then to Kekäleenmäki, Ruokolahti. There Juho Vohlonen worked as smith and also did some farming. Helena and Juho Vohlonen weren’t highly educated, but they had decided their children will get the highest education possible. Including daughters, which wasn’t very typical of that time. Earlier stages of school were done in Ruokolahti, later stages in Lappeenranta. Tuomas went to college in Vyborg. After that Tuomas studied in Finnish polytechnic to become a surveyor. Interests and influences Vohlonen siblings were all interested in outdoor living, sports, hunting and fishing. Tuomas’ brother Kelpo Vohlonen was a competition-level wrestler trained by an olympic winner Verner Weckman, but it's told Tuomas still defeated him easily in wrestling. Tuomas was attracted by wilderness, distant districts, snow fields and open waters. Even when he had settled in Helsinki, he travelled to Saimaa as often as possible. There he had a small boat with outboard motor and a