StNicholas [serial] . s voltage? The term is familiar. You all know that to force water through apipe requires a certain pressure, and the smallerthe pipe the higher is the water pressure requiredto keep the water moving. In other words, waterpressure corresponds to electrical voltage, andthe amount of water flowingcorresponds to the amount ofelectrical current, or amperes,flowing. You will thereforesee that in order to generatea great deal of heat we willhave to use a certain amount ofcurrent and also have to offerresistance to its flow, maintain-ing sufficient voltage in orderto keep it flow
StNicholas [serial] . s voltage? The term is familiar. You all know that to force water through apipe requires a certain pressure, and the smallerthe pipe the higher is the water pressure requiredto keep the water moving. In other words, waterpressure corresponds to electrical voltage, andthe amount of water flowingcorresponds to the amount ofelectrical current, or amperes,flowing. You will thereforesee that in order to generatea great deal of heat we willhave to use a certain amount ofcurrent and also have to offerresistance to its flow, maintain-ing sufficient voltage in orderto keep it flowing, as the heatdepends upon the amount ofcurrent forced through the one of the commercial car-heaters the resis-tance-coil is wound upon a porcelain support, anda coil of great length is used. This aids in gettingthe heat out into the surrounding air, as thegreater the heating surface the more heat will beradiated. On account of the absolute cleanliness of theapparatus, the ease of turning on the heat with an. ANOTHER FORM OF ELECTRIC HEATER TO GOIN CROSS-SEAT CARS. electric switch, and the extreme light weight ofthe heaters, electric heating is coming into usevery rapidly.—Thomas Farmer, Jr. WE WILL BE IN THE COMETS TAIL According to the calculations of the astronomers,on May eighteenth the earth will be plunged intothe tail of Halleys comet, while the head will befifteen millions of miles away. Similar passages of the earth through the tailsof comets have previously occurred without pro-ducing any appreciable effect. There have beenwild tales of the effects of poisonous gases, butall these are without foundation. It is not proba-ble that our atmosphere will be affected so thateven the most skilled chemist can discover achange in its composition. No one need fear be-cause our earth is brushed by the tail of a comet. 648 NATURE AND SCIENCE FOR YOUNG FOLKS [May, THE MOON TYPE FOR THE BLIND In the year 1840 a young man, William Moon,living in the town of Brighton, Engl
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