sauna on a beach he had entirely bought. Orienteering was one of Tuomas' favorites, and eventually it became the work of his life. As inventor Oldest of Vohlonen’s innovations was to turn the compass needle into vertical position. Through this, the needle stabilized more quickly. After many decades Vohlonen returned developing the compass and invented a method of fabricating the needle chamber. With this method the needle chamber could be sealed hermetically and the chamber had a waved bottom plate to stabilize the pressure. He also improved many nautical and airplane compasses. During the same time, he developed a device for measuring height, for example of trees. He also developed a holder for compass. It was named PIVO, an abbreviation of names Pihkala and Vohlonen. His ski bindings has been playing a role in development of Finnish skiing. In the 1930s, living in Helsinki, he started developing the bindings. Because of new version of binding, also the ski boots had to be redeveloped. Spark devices of combustion engines were of his interest in the 1920s. He built them in Pori. He had a small factory for them, and he went on with them later in Helsinki, having them produced under brand Mars. Because of his innovation, the frame of magneto could be manufactured from a single piece. He also invented a starting assistant for magneto, which gave out a full spark even with slow revolutions. In farming he developed a classifier for grain, and for forestry he developed a plow, both later fabricated by Rosenlew. In surveying, in addition to the tree height measuring device, he developed a device for angular measuring and also other assistive gear. He developed a method for fast reading and learning. Engineer Tuomas Vohlonen died on 27 March 1939, at age of 61. He is buried in Ruokolahti, Finland. Lawsuits about patents The original patent On 10 April 1933 Tuomas Vohlonen applied for a patent for a liquid compass, with the description "liquid compass with compass needle and liquid entirely sealed in a container made of celluloid". On 3 September 1934 Vohlonen supplemented the application with edited patent demands: 1: Method of manufacturing a liquid compass, in which the liquid chamber is manufactured of two or more pieces and jointed by gluing or soldering, to form a sealed chamber, 2: Liquid is pressed into chamber through a small hole, which is then sealed with glue