Technology of a Toaster _ historyPresentation Transcript
Why do people toast bread?
To preserve it To makeitcrunchier To makeitsweeter To makeit perfect for spreads
Before the toaster bread was toasted over an open firewith the help of a variety of simple tools.
1900s: electricity in all householdstherecame a wave of technologicalinnovationsand a demandforhouseholdappliances, one of themthe toaster
First: embeddedheating system
March1905Nichrome (Albert Marsh)
Surface of toast needs to beheatedabove 154°CNeed of a wirethatreaches high temperatures without beingdamaged of starting a fire. Nichrome(alloy of nickel and chromium)
Numerous prototype electric toasters and in1909 : firstelectric toaster (Frank Shailorfor General Electrics)
This was the firstcommerciallysuccessfulelectric toaster Problems: When is the toast ready? Flippingwithyour handsburns!
1913 Lloyd and HazelCopeman: ‘‘automatic toaster’’Turning the toast without touchingit
Five toaster related patents ontheirnames Manycompaniespaidroyalties to Copemanor findotherways to turn the toast.
History Problem: burnt toast Byincorporatingsprings and a variable timer: pop-up toaster onMay 29, 1919 by Charles Strite PatentedonOctober 18, 1921 Manufactured and sold to the Childs restaurant chain Redesign in 1926: “the Toastmaster” available to the public
History Major breakthrough in 1928presliced-loaf and sealed-bagprocessby Otto Frederick Rohwedder 1930sliced Wonder Bread 1933 more slicedthanunslicedbread Strite’spop-up made sensenow and became a standard in American households