. QST . symbol of craftsmanshipfor over 23 years Valpey measures eachcrystal for surfaceflatness using a Preci-sion Optical Flat withmonochromatic lightin a Valpey-designedInterferometer. Paral-lelism and surfaceflatness are measuredto millionths of aninch — another stepin the Valpey qualitycontrol process. Manufacturers of ultrasonic transducersand delay lines are assured the ultimatein equipment performance when theyspecify Valpey. For experimental labsor production runs, Valpey is equippedto provide crystals to 60 Mc, meetingthe most rigid >^ VALPEY ^ifsfat 1444 Highland
. QST . symbol of craftsmanshipfor over 23 years Valpey measures eachcrystal for surfaceflatness using a Preci-sion Optical Flat withmonochromatic lightin a Valpey-designedInterferometer. Paral-lelism and surfaceflatness are measuredto millionths of aninch — another stepin the Valpey qualitycontrol process. Manufacturers of ultrasonic transducersand delay lines are assured the ultimatein equipment performance when theyspecify Valpey. For experimental labsor production runs, Valpey is equippedto provide crystals to 60 Mc, meetingthe most rigid >^ VALPEY ^ifsfat 1444 Highland StreetHolliston, Mass. -)><1/Mat CORPORATION OB3D llMtH CODEl SPEED UP Your RECEIVING with G-C Automatic Sender Type S $ Postpaid in U. S. A. Housed in Aluminum Case Black Instrument Finished. Small—Compact—Quiet induction type motor. 1 1 0 Volts—60 Cycle Adjustable speed control, maintains constant speed at any Set-ting. Complete with ten rolls of double perforated tape. A widevariety of other practice tapes available at 50c per roll. GARDINER & COMPANY STRATFORD • NEW JERSEY
Size: 1438px × 1737px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectradio, bookyear1915
