How to design an actually good toaster with lessons from the 1940's

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这台早期烤面包机让恒温器响应面包表面的热辐射。第二片放进去时机器已经热了，传感器对着面包能够补偿一个固定计时器看不见的差异。

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Having the thermostat react to the surface temperature of the bread

It not only compensates for a hot toaster, but for cold bread.