Rod Oven
A look at what is currently available on eBay
 Keen K200S Dry Rod Oven 200 LB. Capacity 120V US $532.87 
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 KEEN KT-50 DRY ROD OVEN 50 LB. CAPACITY 120V/230V US $298.87
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 Keef Welding Rod Oven US $200.00
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 KEEN K450 DRY ROD OVEN 450 LB. CAPACITY 120V NEW US $784.87
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 Lincoln Hydroguard Welding 10 lb. Rod Oven K2939-2 US $145.00
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 KEEN K-10 DRY ROD OVEN 10 LB. CAPACITY 120V/230V US $154.87
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 Keen KT-15 Portable Welding Rod Oven * NEW * Dual Voltage US $147.90
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 Ronco Gear Spit Rods,Fits 3000 Ronco Ovens US $9.99
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 HYDROGUARD PORTABLE WELDING ROD OVEN 115 - K2939-1 US $143.00
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 WELDING ELECTRODE ROD OVEN - 50# 115V - NEW - 100 TO 300 DEGREE US $329.95
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 Lenco Le Lro-50-120 Rod Oven 50 Lb 120v US $247.56
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 Lenco 380-01910 Le Lro-10-120 Rod Oven 10 Lb 120V US $141.02
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 Lenco Rod Ovens -le lro-10-120 rod oven 10 lb 120v 1910 US $139.99
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 Lenco Rod Ovens -le lro-50-120 rod oven 50 lb 120v 1950 US $236.99
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 Lenco 380-01950 Le Lro-50-120 Rod Oven 50 Lb 120V US $243.46
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 Phoenix 382-1205520 Ph 1205520 Type 5 120-240V 50Lb Dry Rod Ii Oven US $630.62
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 WHIRLPOOL OVEN LATCH ROD 3196961 US $5.99
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 Lincoln Hydroguard Welding 10 lb. Rod Oven K2939-1 US $145.00
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 Rod Electrode Oven for Welder US $175.00
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 Lincoln Portable HydroGuard 10 lb. Rod Oven 115V K2939-1 US $144.87
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 HENKEL K-450 BENCH WELDING ROD OVEN US $250.00
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Thermodynamics question?
At 19°C, a rod is exactly 20.05 cm long on a steel ruler. Both the rod and the ruler are placed in an oven at 219°C, where the rod now measures 20.15 cm on the same ruler. What is the coefficient of linear expansion for the material of which the rod is made?
The coefficient of linear expansion gives how much a material expands (or, rarely, contracts) with a rise in temperature. A coefficient of zero says that the material doesn't change its dimensions at all as temperature changes.
The tricky part of this problem (I'll do it the first, "simple" way below, then the RIGHT way) is that the ruler also expands.
==== "simple", and INCORRECT way, NOT accounting for ruler length change: ====
For this problem, we have the starting length of 20.05 cm, and ending length of 20.15 cm, for a change of 0.10 cm (one millimeter) over a temperature range of (219C - 19C) = 200C. Thus, for every 200C of temperature change, the rod changes length by about 0.10 cm. That means for every 100C, the length change is 0.05 cm (1/2 mm), or for every 1C, the change is 0.0005cm (five one-thousandths of a mm, or about 1/200 mm). Therefore, the coefficient of linear expansion for this system is
0.0005cm per degree C <== ans
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==== CORRECT way, accounting for ruler length change ====
The _steel_ ruler has a linear expansion coefficient of roughly 12.0x10^-6 per degree C (according to http://en.wikipedia.org/wiki/Coefficient_of_thermal_expansion#Thermal_expansion_coefficients_for_various_materials). This means that over the temperature range of 200C, the ruler expands by a factor of roughly 0.0024, so that each centimeter reads 0.24% longer than before. A measurement of 20.15cm REALLY means a measurement of 0.24% less than this, or 20.10164 cm.
Thus, the material actually expands by ~ 0.102 cm over that 200 C temperature range, for a linear thermal expansion coefficient of 0.102cm /(200C) ~ 2.16x10^-6 meter/Kelvin. The rod was about 20 cm long (0.2m), so this is about
1.075x10^-5 per Kelvin. <== ans.
