Popular science monthly . connectedwith it by wires. Its principle isthat of the well-known Wheat-stone bridge by which resist- which leadsfrom the recording apparatus and the drybatteries to the sensitive resistance coilswhere the temperature is to be taken carriesthree insulated wires. Through one of themthe current passes to the sensitive terminal,where it is divided and returned throughtwo minute coils of copper and Germansilver wire. These metals are affecteddifferently by changes in changes affect differently the free-dom with which a current
Popular science monthly . connectedwith it by wires. Its principle isthat of the well-known Wheat-stone bridge by which resist- which leadsfrom the recording apparatus and the drybatteries to the sensitive resistance coilswhere the temperature is to be taken carriesthree insulated wires. Through one of themthe current passes to the sensitive terminal,where it is divided and returned throughtwo minute coils of copper and Germansilver wire. These metals are affecteddifferently by changes in changes affect differently the free-dom with which a current of electricity willpass through them, and this difference in-dicate what the temi)erature is. Forty-seven thermometers were buried inthe dam, the lowest being below the founda-tion. They were connected with switch-boards placed at central points, the cables,carefully protected, being buried in themasonry as it rose. There are three switch-boards, the lowest being stationed in anook in the long inspection-galler)\ I -flK^. Will the Great Sphinx ScowlWhen She Sees This?X seeing America first one should not? ivcrlnok the Sphinx built at Blue Point,Long Island, by WilliamGraharq. This domesticSphinx is just one seventh thesize of the original greatSphinx in Egypt, and it!s just as mute. Itweighs forty-two tons. The idea of decoratinghis Iront yard with a copyof Egypts great at-traction came to when he wasrenuning a largequantity of sandfrom his lawn. In-stead of cartingthe sand away, ashe had done inpast years, he col-lected it in a hugepile, and thendrew up plans forhis Sphinx. Thesand was mixed^\ ith concrete andiron head of Mr. Grahamsjfi Sphinx is solid, weighing ten tons.^^~*i* The lower part of the image hasa circular chamber with an open-ing at the rear. Seats and pillars of concreteextend around its inner walls. The head of the Sphinxweighs ten tons. Thelower part of the imageis a room with anopening at the rear 868 Popular Science Moiiilily Laying a Br
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
