Patent ID: 8303180

Claim:
Temperature recorder for measuring the temperature of a medium including a bimetal means ( 4 ), which changes its form when the temperature is changed, which change of form is registered, whereby wherein the bimetal means is placed in one end of a tubular cover ( 1 ), which end is turned against the medium when the temperature is measured, that a piston ( 2 ) is arranged within the tubular cover being moveable to and from within the tubular cover ( 1 ), wherein the end of the piston ( 2 ) which is turned to the bimetal means ( 4 ) will abut the bimetal means and will be pushed by this when the form is changed, wherein the force from the change of form thus will overcome opposite forces including the weight of the piston and friction forces between the piston and the tubular cover, characterized in that the tubular cover ( 1 ) is transparent and furnished at least partly with a screen pattern ( 5 ) and that the piston ( 2 ) is furnished with a second screen pattern ( 9 ) which cooperates with said first screen pattern, so that when the piston ( 2 ) reaches a certain position by the change of form of the bimetal ( 4 ), a specific pattern ( 11 ) will be formed by the two screen patterns, wherein the specific pattern is a pattern indicative of the measured temperature.