Popular science monthly . ys begin to swim about and quackas if they were alive. The result is thatthe inventor goes home with a full bag,for no wild duck can resist the mechani-cal wiles of his decoy. His duck is provided with a phono-graphic means for automatically givingat predetermined inter\als a call or cr> swims about in the water with the aidof the propeller and an adjustablerudder, either in circles or in anydirection the hunter washes. The decoy is composed of two parts,bottom and top, which can be openedfor cleaning and repairing. A clock- work mechanism dri\es the propellera
Popular science monthly . ys begin to swim about and quackas if they were alive. The result is thatthe inventor goes home with a full bag,for no wild duck can resist the mechani-cal wiles of his decoy. His duck is provided with a phono-graphic means for automatically givingat predetermined inter\als a call or cr> swims about in the water with the aidof the propeller and an adjustablerudder, either in circles or in anydirection the hunter washes. The decoy is composed of two parts,bottom and top, which can be openedfor cleaning and repairing. A clock- work mechanism dri\es the propellerand also the sound-record of the phono-graph. As the mechanism is set inaction the stylus, or needle, as well as thepropeller is operated. A cylinder ordisk is used for the record. A control-ling cam renders the needle inopera-tive at certain intervals, so that the callsor cries are sounded makes the phonographic recordof the quack that leads a duck to itsdoom? We are baflfled. 509 A Famous Outdoor Organ. When Festival Hall was demolished along with the other buildinus at the Panama-Pacific Exposition, the famous orean was removed to San Diego where it rcmams apc^anent attraction used for outdoor concerts, as the e-ft of Rudolf Sprcckcls 510 A Curious Clock BuiltPrinciple IN this very interesliiig clock thetime is recorded on a parchmentstrip five-eighths of an inch wide andeighteen inches long, fromthe ball is suspen-ded. The time is in-dicated by a figureof Father Timeplaced at the edge,his fingers pointingto the hour. Nomainspring driv-esthe clock, themotive power beingsupplied by thevtotal weight in themoving ball andFather Time. Ale\-er controls themo\cment. As soon as theball is suspendedthe clock begins togo and continues togo until the eigh-teen inches ofparchment havebeen unwound, atthe end of thirtyhours. To rewindthe clock, the ball issimply lifted up towhatever the timemay be. If liftedtoo far it can bepulled down. It doesis kept in position byA sm
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
