Abstract: An automatic thermograph comprising a means for sensing a variation of temperature by use of a gas and a gas absorbing substance container therein; a recording section including a means for coverting said variation of temperature into a variation of pressure, a means for counteracting said converting means for actuating a lever according to the variation of pressure to turn a nib fixed on an extension of said lever and record the variation of temperature; and a cartridge containing therein a chart paper and removably attached to the recording section. With this invention, collecting data for controlling temperature in a cooled show-case or in a reservoir of perishable foods, blood or vaccines can be done with a thermograph which is low-priced, small-sized and easy to handle.