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nsing lens in which the light is confined to an annular pencil by means of a small, round diaphragm (the spot), and used in dark-field ilumination; -- called also spotted lens. -- Spot rump (Zoöl.), the Hudsonian godwit (Limosa hæmastica). -- Spots on the sun. (Astron.) See Sun spot, ander Sun. -- On, or Upon, the s…

formation of sounds. It is due essentially to long-continued spasmodic contraction of the diaphragm, by which expiration is preented, and hence it may be considered as a spasmodic inspiration.

The diaphragm used in optical instruments to cut off the marginal portions of a beam of light passing through lenses.

length) due to pulsations of the line current in a fine wire connected with the receiver diaphragm.