St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 17
for experi-mental purposes, forcharging condensers,for medical pur-poses, etc. It isnow being used forX-ray work, andconsiderable ad-vancement has beenmade within a fewyears in the construc-tion and efficiencyof the machines. Fig. 10. … ABOUT FRICTIONAI, ELECTRICITY. 15 With the modern machines large sparks are producedby merely turning a crank, enough eledtricity being pro-duced to imitate a small thunderstorm. The sparks ofhome-made lightning will jump several inches. Do not think that eledlricitj is generated in a com-mercial…
Electricity
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