Etiquette: Which Hand for Forks?

Where the course requires the use of the knife (the roast), the fork is held in the left hand while cutting, then the knife is laid on the plate...

Q. A friend and I, in discussing table etiquette, disputed about the correct use of the fork, when the knife is in use also. She considers the fork should always be taken by the right hand and I claim that, where the course requires the use of the knife, the fork should remain in the left hand. Of course, for salad, dessert, etc..., the fork is for the right hand. Kindly enlighten us.  

A. Where the course requires the use of the knife (the roast), the fork is held in the left hand while cutting, then the knife is laid on the plate, a little to the right, and the meat is eaten from the fork held in the right hand. — Florence Austin Chase, 1929

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