A Highly Sensitive Electrometer(en)(2s) by Parson A. L.

By Parson A. L.

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No opener? No problem! Set the can on a rock in the fire and stand back. Eventually the can explodes, spewing beans all about and leaving half a can heated and ready to eat. ) Many inventors turned their attention to can openers in the mid- to late 19th century. Ezra Warner invented the first can opener in 1858 (patent number 19,063). The type of opener used today, employing a cutting wheel, wasn’t invented until 1870, 60 years after canned foods were introduced. The first electric can opener was created by E.

This forces electricity through the light instead, announcing that coffee is ready. But in this mode, current still flows through a warming coil to keep the coffee hot. The heating element is embedded in the side of a small well that protrudes from the center of the reservoir’s base. Inside the reservoir, the water that fills the well is heated, and then it bubbles up the central “stem,” which also sits in the well, toward the basket filled with coffee grounds. The heated water squirts out the top of the stem and over the grounds.

This thermostat’s temperature range is 265° to 375° F. electrical contacts thermostat dial D ISHWASHER History of the Dishwasher Joel Houghton invented the first machine to wash dishes in 1850 (patent number 7,365). ” But I couldn’t find a record of anyone ever using his device. Improvements in the dishwasher’s design were suggested by many people—including quite a few women inventors. It’s rare to find early patents assigned to women, partly because society often discouraged them from pursuing anything technical, and partly for legal reasons—married women didn’t have equal property rights, and patents are considered a form 40 Á Dishwasher 41 of property.

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