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B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
B29D17/00—Producing carriers of records containing fine grooves or impressions, e.g. disc records for needle playback, cylinder records; Producing record discs from master stencils
Landscapes
Engineering & Computer Science
(AREA)
Mechanical Engineering
(AREA)
Printing Methods
(AREA)
Description
BERLIN. GEDRUCKT IN DER REICHSDRUCKEREI.BERLIN. PRINTED IN THE REICHSDRUCKEREI.
Claims (1)
Patent-Anspruch:Patent claim:Verfahren zur Herstellung von scharfen Positiven aus den negativen Aufnahmen
von Schallwellen, dadurch gekennzeichnet, daß die Masse in der negativen Form als
voller Block hergerichtet, mittels Messer ausgehöhlt, durch einen eingetriebenen Keil
oder Dorn fest an die Wände des Negatives angepreßt und ev. nach Herausnahme desselben durch Einführung des
Kaliberdorns in der gewünschten Weite erhalten wird.Process for producing sharp positives from negative images
of sound waves, characterized in that the mass is in the negative form as
full block prepared, hollowed out by means of a knife, by a driven wedge
or the mandrel firmly pressed against the walls of the negative and possibly after removing the same by inserting the
Caliber mandrel is obtained in the desired width.