Forum – 2000-06-01

Simple solutions for converting C to F

The March 2000 “Simple Solutions” column featured this method for converting Centigrade to Fahrenheit.

The calculation can be made quickly and easily, probably without using paper and pencil. Multiply degrees C by 2 and then move the decimal point of the result one place to the left. Subtract this number from the original calculated figure and add 32 to get F.

For example, assume you want to convert 50.5 C to F. Multiplying by 2 yields 101. Moving the decimal point left converts this number to 10.1. Subtracting 10.1 from 101 equals 90.9. Adding the 32 makes 50.5 C equal to 122.9 F.- Jack Rutherford, Engineering Technician, Eastman Chemical Co., Kingsport, TN

Since the original publication of the item, several readers have written to us with their own tried-and-true formulas for the conversion.

Multiply deg C by 1.8 and add 32. Another method is to subtract 32 from deg F and multiply the result by 0.515.- Timothy Cremeans, GM, Flint Tool & Die, Flint, MI; and JD Hindel, Associate Process Analyst

One thing not covered by the tip was how to convert when using negative temperatures. Using the tip from Mr. Rutherford could lead to an error. To easily convert, multiply deg C by 9.5 and add 32.- Tom Blaskey, Manufacturing Leader, International Paper, Texarkana, TX

To convert C to F, multiply deg C by 1.8 and add 32. To convert F to C, subtract 32 from deg F and divide the result by 1.8.- John Verbosh, Maintenance and Facilities Manager, Central CPVC, Madison, AL

Wrong photo

The April 2000 issue contained an error on p 114 of the “New Products” section. A photo for the PrismGlo Hekaton luminaire ran with the item for Venture Lighting. The photo should have been part of the item from Holophane Corp. The corrected version is below. For more information on this product, please visit the company’s web site.

Luminaire controls lighting

PrismGlo Hekaton luminaire offers controlled uplight and downlight for a totally luminous environment. Advantages include brightness prismatics, balanced horizontal and vertical illumination, and reduced direct and reflected glare. The fixture has a high efficiency ballast and promotes wide spacing between units. The luminaire may be used with 150-400-W high-pressure sodium, 175-400-W metal halide, and 500-W incandescent lamps.

Holophane Corp.

www.holophane.com

Wrong number

An incorrect telephone number was listed for William J. Stevenson, III, author of “Dust explosion strategies” (PE, April 2000, p 78, File 7550). Mr. Stevenson’s correct phone number is 561-753-9556.

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