21. A dynamometer is used to measure muscle power.
22. A fan is used to retrieve the flue gas heat, utilising a stainless steel condensing coil.
23. A fathom is the unit of measurement used in calculating sea depth.
24. A federal law enforcement official said prosecutions seldom are initiated unless the eavesdropper deliberately has used a monitored conversation for other purposes.
25. A few dishonest dealers give the used car trade a bad name.
26. A few motorcycle shops occasionally sell used ones.
27. A flat stone was used as a table.
28. A floral chintz fabric is used at the windows and for the upholstered seat and valance under the white bed linen.
29. A flower bed could be used, or a low wall built.