WORKING Receipts / S01
Line by line
Every claim, with its source.
Sources fetched 2026-10-07. RD = Don Murray, "Percy Spencer and His Itch to Know", Reader's Digest, Aug 1958, p.114, full text at https://www.smecc.org/percy_spenser_biography.htm (transcribed by Spencer's grandson from the family scrapbook).
| Shot | Claim as spoken / on screen | Source and verbatim support |
|---|---|---|
| open | "A radar engineer stands beside a running tube, and something in his pocket starts to cook." Mid-1940s. | RD: "One day a dozen years ago he was visiting a lab where magnetrons, the power tubes of radar sets, were being tested. Suddenly, he felt a peanut bar start to cook in his pocket." (a dozen years before 1958, so about 1946; the patent was filed Oct 1945, so "mid-1940s" is the honest range). |
| who | "Orphaned twice by age seven" (spoken: "Orphaned by seven") | RD: "twice orphaned when a child. His father died when he was 18 months old, and soon his mother left home... when Percy was only seven, this second father [his uncle] died." |
| who | "Out of school at twelve" / on screen "SPOOL MILL AT 12" | RD: "When he was 12 he trudged off to the spool mill". RD: "the orphan who never went beyond grammar school". Lemelson-MIT (lemelson.mit.edu/resources/percy-spencer): "He dropped out of grammar school when he was 12 years old to work in a weaving mill" (mill type differs; we use RD's "spool mill"). |
| who | "In the Navy, he taught himself radio, standing night watch." | RD: "He joined the Navy to learn wireless telegraphy... 'I just got hold of a lot of textbooks and taught myself while I was standing watch at night.'" |
| war | "A master machinist needed a week to make one magnetron." | RD: "It took a master machinist a week to finish just one - and thousands were needed". |
| war | "Spencer changed how they were built. Raytheon went from a hundred a day to twenty-six hundred." | RD: "By this time Spencer had heckled and badgered production up to 100 a day... Instead of carving the magnetron out of solid metal, Spencer... stamped thin cross-sections of the tube out of copper and silver-solder... production of magnetrons jumped to an astounding 2600 a day." |
| turn | "A candy bar melts in his pocket" (the famous version) vs. "the earliest telling I can find, from 1958, says a peanut bar" | RD says "a peanut bar start to cook in his pocket" (cook, not melt; not chocolate). Later retellings say chocolate/candy: MIT Technology Review, 1 Jan 1999: "he came too close to a running magnetron tube and the candy began to melt"; Lemelson-MIT: "the chocolate bar in his pocket had started to melt"; APS News (Oct 2015): "a candy bar in his pocket had melted". "Earliest I can find" is our search result, not a proof of priority; wording is deliberately hedged. |
| tests | "Others had noticed it. Spencer got curious." | RD: "Other scientists had noticed this phenomenon, but Spencer itched to know more about it." |
| tests | "Popcorn exploded across the lab." | RD: "He sent a boy out for a package of popcorn. When he held it near a magnetron, popcorn exploded all over the lab." |
| tests | "Then an egg: an engineer peeked in, and caught a faceful." | RD: "Next morning he brought in a kettle, cut a hole in the side and put an uncooked egg (in its shell) into the pot... A skeptical engineer peeked over the top of the pot just in time to catch a faceful of cooked egg." |
| patent | "October eighth, 1945, he filed the patent." | US2495429A, "Method of treating foodstuffs", P. L. Spencer, assignor to Raytheon Manufacturing Co.: "Application October 8, 1945, Serial No. 620,919"; "Patented Jan. 24, 1950". https://patents.google.com/patent/US2495429A/en |
| patent | "The drawing has no box. Just magnetrons and a conveyor." | Drawing sheet labels (read from the PDF): "MAGNETRON OSCILLATOR" (x2), "COMMON WAVE GUIDE", "FOOD TO BE COOKED", "CONVEYOR SYSTEM". Text: "a transversely-moving conveyor system 28 for carrying the foodstuff to be cooked into a region where it will be exposed to the energy emanating from said wave guide". The drawing shows no oven cavity. |
| patent (on screen, not spoken) | Highlight: "METHOD OF TREATING FOODSTUFFS" | Title of the patent as printed on the sheet. |
| mech | "The magnetron makes microwaves, around 2.45 gigahertz." | FDA (Microwave Ovens): a magnetron produces the microwaves. HyperPhysics: "Modern microwave ovens operate at the frequency 2,450 MHz." Baird (WTAMU) cites a measured oven with "several broad peaks that spanned from 2.40 to 2.50 GHz" (hence "around"). |
| mech | "They bounce off the metal walls." | FDA: the microwaves "reflect off the metal interior of the oven". |
| mech | "The field flips, twisting molecules. They collide. That's heat." | Baird: the field "exerts a force on the molecules... causing them to rotate"; collisions turn "ordered rotational motion into disordered motion, which we macroscopically call heat"; "Many types of molecules... not just water". FDA adds that water molecules vibrate. |
| mech | "And no, it is not tuned to water." | Baird: "The microwaves in a microwave oven are not tuned to a resonant frequency of water." (see reels/01-microwave/claims.md). Re-checked 2026-10-07. |
| radarange | "By 1947: the Radarange." | IEEE Spectrum, A. Marsh, 30 Dec 2022: "The original Radarange came out in 1947 and was intended for commercial kitchens." Other sources say 1946 (APS News: "the Radarange hit the market in 1946"; IEEE Ackerman: "unveiled by Raytheon in 1946"); the script says "By 1947". |
| radarange | "One point seven metres tall. Three hundred forty kilos. Water-cooled." | IEEE Spectrum (Marsh): the water-cooled model was "approximately 1.7 meters tall and weighing 340 kilograms". 340 kg is about 750 lb, matching Lemelson-MIT ("weighing about 750 pounds"). Lemelson says "standing 6 feet tall" (~1.8 m). On-screen "1.7 M · 340 KG · WATER-COOLED" is the IEEE figure. Water-cooling also from IEEE Spectrum (Ackerman, 2016): "magnetron tubes that had to be continuously water cooled". |
| home | "A home model came in 1955 at $1,295." | IEEE Spectrum (Ackerman): "By 1955... the first microwave oven designed for consumers went on sale from Tappan. The Tappan RL-1 was wall mounted and cost US $1,295". |
| home | "In 1967, a countertop one for $495." | IEEE Spectrum (Ackerman): "The first Amana Radaranges started showing up on household countertops in 1967 for a more affordable $495." Marsh: "compact model designed for the modern home kitchen. The price had fallen drastically, to $495". |
| home | "By 1975, microwaves outsold gas ovens." | IEEE Spectrum (Marsh): "In 1975 sales of microwave ovens in the United States outpaced those of conventional gas ovens for the first time." (US only; the script is in an American-history context and the caption says nothing broader). |
| close | "Every time you press start, a radar tube goes to work." | FDA: a magnetron inside the oven produces the microwaves; RD: magnetrons are "the power tubes of radar sets". A close line, not a quantified claim. |
What the drawing simplifies
- No licensed portrait of Spencer exists in our set: the "who" shot is typography.
- The 1947 Radarange has no licensed photo: the "radarange" shot is typography.
- The Tappan RL-1 photo is a later museum/collector unit (Cduthy, 2020); it shows the 1955 consumer model in kind, not a photo from 1955.
- The Amana Radarange photo is a late stainless model from the 2000s, used only as "today"; it is NOT the 1967 oven.
- The Raytheon assembly photo (c. Sept 1945) and MIT Rad Lab photo (July 1945) show war-era magnetron work, not Spencer himself and not the candy event.
- The mech rig is schematic, not to scale; waves, molecules and hot spots are illustrations (as in reel 01).
- The patent sheet is the real drawing. It illustrates a conveyor-fed, wave-guide design, not a box oven.
Checked, and cut
- "Chocolate bar melted": the 1958 RD account says a "peanut bar" starting to "cook". Chocolate appears in later retellings (MIT TR 1999, Lemelson-MIT). The script says so and attributes the earliest I found to RD.
- "Spencer was the first to notice microwaves heating things": FALSE. RD itself says "Other scientists had noticed this phenomenon" (also Wikipedia: "Spencer was not the first to notice this phenomenon, but he was the first to investigate it", tertiary).
- "The candy bar story comes from Spencer himself": UNVERIFIED. RD is Murray's narration of an interview ("a dozen years ago"); the sentence is not a quoted Spencer line. Lemelson-MIT writes "By his own account", but gives no primary source.
- 1947 price: sources disagree ($2,000-3,000 MIT TR 1999; $3,000 Lemelson-MIT; $5,000 several secondary sites). Not spoken. Weight/height used from IEEE (Smithsonian's collection record was inaccessible: si.edu returned a bot-check).
- "Spencer's popcorn was the world's first microwaved popcorn": Wikipedia's wording only. Not used.
- "Spencer expanded the division from 15 to more than 5000 (RD) / over 1,000 (Wikipedia)": sources conflict. Not used.
- "Raytheon filed the patent for the box oven in 1945": FALSE as stated. US2495429 (1945) is a conveyor/waveguide method patent; Spencer's follow-up US2605383 "Means for treating foodstuffs" was filed 1947-02-24, claiming priority to 1945 (Google Patents). Marsh (IEEE) links US2605383 under the "Means for Treating Foodstuff" title. Not spoken.
- Speedy Weeny (microwave-hot-dog vending machine, Grand Central, Jan 1947): APS News verified, held out as a possible extra beat; cut for length.
- Tappan sold only 34 units in 1955: from a Smithsonian snippet (search result) and Tedium; the Smithsonian page itself could not be fetched. Not spoken.
- Egg claim in the patent: "an egg may be rendered hardboiled with the expenditure of 2 kw.-sec... compared with 36 kw.-sec" (verified in US2495429 text); cut for length, available as a possible on-screen overlay.
Sources
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