i8o 



VOCABULARY. 



mouvement de rotation, rotary 

 motion, rotation. 



de translation, motion of trans- 

 lation. 



mouvement de va-et-vient, alter- 

 nate motion, backward and for- 

 ward motion, motion to and 

 fro. 



N 



Neutre, neutral. 



In chemistry, exhibiting neither acid 

 nor alkaline qualities. 



niveau superficiel, surface level. 



niveau (de chaudiere), water-level, 



water-mark, 

 noyau, core (newel). 

 noyer, to sink in. 



Ochre (ocre )rouge, red ochre, 

 ohm, ohm. 



The unit of electrical resistance. 

 Divide the number of amperes by the 

 number of volts to obtain the resist- 

 ance in ohms. 



onde lumineuse, light-wave. 

 ondulation, undulation, waving. 

 or battu, leaf gold, beaten gold, 

 organe moteur, driving part, 

 orientation (de la turbine), trim- 

 ming, placing, setting. 



orifice, orifice, opening, hole, pipe, 



nozzle. 



outillage, plant, tools, 

 ouverture (d'air), air-hole, 

 oxydable, oxidizable. 



Capable of being oxidized. 



oxydation, oxidation. 



The act or process of oxidizing, or 

 causing a substance to combine with 

 oxygen. 



oxyde de carbone, carbonic oxide, 

 protoxide of carbon. 



Palier, block, bearing, horizontal 

 track. 



en palier, on a level. 



palier horizontal, track, level. 



paliers de 1'arbre, bearings of the 

 shaft. 



papier d'e'meri, emery-paper. 



de tournesol, litmus-paper. 



parabole, parabola. 



parabolique, parabolic, paraboli- 

 cal. 



paradoxalement, paradoxically. 



parallelisme des couples, parallel- 

 ogram of couples. 



paralle"logramme articule", jointed 

 parallelogram. 



parcours, trip, road, way covered. 



paroi, side, partition. 



parquet de bois, wooden floor. 



passerelle, foot-bridge, stile. 



pavage, paving. 



pave", pavement, paved floor, 

 block. 



pendule, pendulum. 



