. Electrical news and engineering . onal M^ CANADIflN EbECTRlCAb NEWS July, 1896 liowever. Tlie zinc siilphale freezes at 27 Fall, and some moansmust be taken 10 prevent its freezing. In Vlg. 4 is represenleilthe arrangement as put in the present meter to prevent the solu-tion from freezing. It consists of a strip of brass and steel rivet-led together and fixed at one end, the other being free to is called the thermosLul. When the temperature gets very lowthe brass contracts more than the steel and causes the slri|) locurve making contact with the terminals leading to the lamp,whichon
. Electrical news and engineering . onal M^ CANADIflN EbECTRlCAb NEWS July, 1896 liowever. Tlie zinc siilphale freezes at 27 Fall, and some moansmust be taken 10 prevent its freezing. In Vlg. 4 is represenleilthe arrangement as put in the present meter to prevent the solu-tion from freezing. It consists of a strip of brass and steel rivet-led together and fixed at one end, the other being free to is called the thermosLul. When the temperature gets very lowthe brass contracts more than the steel and causes the slri|) locurve making contact with the terminals leading to the lamp,whichon completing the circuit lights it. When the again the compound strip straightens and Ihe circuil isbroken. .\ patent was filed in 1881 covering this temperature regulatorwhich ai that time consisted of a resistance coil acting as thesource of heal. Some few months later we find still anothermethod of preventing the solution from freezing. This is shownin Fig. 5. It consists as in tlie former of llu- compound strip. -mmum-^ Fxc S. which makes and breaks the contact. When contact is madecurrent is sent round the electromagnet, attracting the armatureto which is attached an arm operating a value which when openallows water to run into the cell underneath containing quicklime,the mixture causing heal. I might state that here in Toronto thetemperature is so uniform (!) we have no thermostat in any ofour meters although thev are all adapted for them. In the next figure is shown diagranimatically tlie Etiison 2 wire
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