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- Timeline of invention (28171 bytes)
3: ...s ambiguity, the date of the first practical, fielded version of the invention is used here.
60: * [[Odometer]] : [[Ancient Rome|Rome]]: [[Archimedes]]?
66: ...ntury BC|200s BC]]: Compound [[pulley]]: [[Archimedes]]
74: * [[1st century]]: [[Rudder|Stern mounted rudder]] in [[History of China|China]]
83: * [[9th century|800s]]: [[Black powder|Gunpowder]] in [[History of China|China]] - List of inventors (14020 bytes)
11: *[[Archimedes]], (circa 287 BC-212 BC), [[Greece]]
12: *[[Manfred von Ardenne]], (1907-1997), [[Germany]]
14: ...s]],(1927 - June, 1996)of the [[Canada|Canadian]] Department of Agriculture — instant mashed po...
19: *[[Robert Baden Powell]]- scouting movement
22: ... U.S. solar inventor and developer; architectural designer. - Capacitor (29664 bytes)
2: ...ade of metal) stacked or rolled to form a compact device, but '''every''' multi-[[conductor]] [[geomet...
7: ... but opposite charge, the ''total'' charge in the device is always zero.
22: ...cumulates on the plates of a capacitor, a voltage develops across the capacitor due to the electric fi...
30: For an ideal capacitor, the capacitor [[current]] is proport...
45: ...rs are usually specified such as 5 or 10%, or broader ranges for some types. Adjustable versions have ... - Computer mouse (29399 bytes)
1: ...movement.<br>'''3:''' Optical encoding disks include light holes.<br>'''4:''' Infrared LEDs shine thro...
3: ... The underside of the mouse houses a device that detects the mouse's motion relative to the flat surf...
5: ... because the cord on early models resembled the rodent's tail, and also because the motion of the poin...
9: [[Image:firstmouseunderside.jpg|frame|The first computer mouse held by invent...
11: ....com/3543541.html 3541541]. Ball and wheel by ''Rider'', 9/74, [http://www.freepatentsonline.com/38354... - Modem (21628 bytes)
1: ...e a signal that can be transmitted easily and decoded to reproduce the original digital [[data]].
3: ...service|POTS]]), and once received on the other side, converts those sounds back into 1s and 0s.
5: ...over [[microwave]] radio links. Some microwave modems transmit more than a hundred million bits per s...
7: ... into electronic digital data streams. Optical modems routinely have data rates in excess of a billio...
9: ... of transmitting analog signals, from driven [[diode]]s to [[radio]]. - Antimony (9093 bytes)
2: {| border="1" cellpadding="2" cellspacing="0" align="right...
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26: | [[Density]], [[Mohs hardness scale|Hardness]]
40: | [[van der Waals radius]] || no data
48: | [[Oxidation state]]s ([[Oxide]]) || ?3, 5 (mildly [[acid]]ic) - Arsenic (12497 bytes)
2: {| border="1" cellpadding="2" cellspacing="0" align="right...
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25: | [[Density]], [[Mohs hardness scale|Hardness]]
39: | [[van der Waals radius]] || 185 pm
47: | [[Oxidation state]]s ([[Oxide]]) || '''+-3''',5 (mildly [[acid]]ic) - Gallium (9500 bytes)
2: {| border="1" cellpadding="2" cellspacing="0" align="right...
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26: | [[Density]], [[Mohs hardness scale|Hardness]]
45: | [[van der Waals radius]]
54: | [[Oxidation state]]s ([[Oxide]]) - Germanium (8776 bytes)
2: {| border="1" cellpadding="2" cellspacing="0" align="right...
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26: | [[Density]], [[Mohs hardness scale|Hardness]]
43: | [[van der Waals radius]]
52: | [[Oxidation state]]s ([[Oxide]]) - Nitrogen (10073 bytes)
1: {{Elementbox_header | number=7 | symbol=N | name=nitrogen | left=[[c...
18: ...smn;'''3''', 5, 4, 2<br />(strongly [[acid]]ic oxide) }}
24: {{Elementbox_vanderwaalsrad_pm | [[1 E-10 m|155]] }}
36: ... such as [[ammonia]], [[nitric acid]], and [[cyanide]]s.
37: ...|thumb|150px|left|Chemistry Clipart .Clipart provided by [http://classroomclipart.com Classroom Clip A... - Rubidium (10211 bytes)
2: {| border="1" cellpadding="2" cellspacing="0" align="right...
4: {| align="center" border="0"
23: | [[Density]], [[Mohs hardness scale|Hardness]]
40: | [[van der Waals radius]]
49: | [[Oxidation state]]s ([[Oxide]]) - Solar cell (27643 bytes)
1: ... consisting of a large-area [[p-n junction]] [[diode]], which, in the presence of [[sunlight]] is capa...
5: ...r_cell.png|thumb|250x|right|A '''solar cell''', made from a poly-crystalline silicon wafer]]
15: ...2662&RS=PN/2402662 US2402662], "''Light sensitive device''"). Sven Ason Berglund had a prior patent co...
19: ... electric power output to the light power input. Ideally, near the equator at noon on a clear day, the...
21: ...rial for solar cells (and all other semiconductor devices) is crystalline [[silicon]]. Crystalline sil...
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