# social studies

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when was the:

Nancy Johnson's hand-crank ice cream freezer

Emeline Hart's commercial oven

Ellen Eglin's clothes wringer

sarah mather's submarine telscope

martha coston's saftey flare gun

emily tassey's dredging pump

henrietta vansittart's (improved version)screw propeller for ships

eliza murfey's packing and material process for parts of steam engines

thedosia jones' vacuum canning process to preserve food

thomas edison's phonograph, electric power station and kinetoscope

lummiere brothers' movie projectors

karl braun's major components for television

h. booth and m. spengler's vacuum cleaner

wright brothers' airplane

invented

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