Renseignements généraux

Nº de série

201

Nº de partie

1

Nombre total de parties

4

Ou

S/O

Brevets

S/O

Description générale

.1 WOODEN BOX HAS COATED CLOTH COVERING; METAL, GLASS AND SYNTHETIC WORKING PARTS. FABRIC COVERING ON BATTERY CONNECTION CABLES..2-.3 PAPER TAPE ON WOODEN SPOOLS..4 METAL CRANK HANDLE HAS WOODEN KNOB. PT BATTERY CASE IS PAPER; METAL FITTINGS. PT VACUUM TUBE HAS GLASS, METAL & SYNTHETIC COMPONENTS.

Dimensions

Remarque : Cette information reflète la taille générale pour l’entreposage et ne représente pas nécessairement les véritables dimensions de l’objet.

Longueur

27,0 cm

Largeur

18,5 cm

Hauteur

18,5 cm

Épaisseur

S/O

Poids

S/O

Diamètre

S/O

Volume

S/O

Lexique

Groupe

Communications

Catégorie

Télégraphie

Sous-catégorie

S/O

Fabricant

Ou

INSTRUCTOGRAPH

Pays

United States of America

État/province

Illinois

Ville

Chicago

Contexte

Pays

Amérique du Nord

État/province

Inconnu

Période

PROBABLY USED BETWEEN C. 1935 AND 1945

Canada

Inconnu

Fonction

USED TO PRACTICE DECIPHERING MORSE CODE.

Technique

AN EXAMPLE OF EARLY EQUIPMENT USED TO AUTOMATE THE TEACHING OF MORSE CODE. SPRING DRIVEN MOTOR DRAWS A PUNCHED PAPER TAPE OFF A REEL & THROUGH A SPRING CONTACT, WHERE IT MAKES OR BREAKS AN ELECTRICAL CURRENT BEFORE BEING TAKEN UP ON A 2ND REEL. CURRENTIS MODULATED BY A VACUUM TUBE OSCILLATOR. MONITORING WITH HEADPHONES, THE USER HEARS "BEEPS" RESEMBLING THE CODED SIGNALS OF RADIOTELEGRAPHY [REF.1]

Notes sur la région

Inconnu

Détails

Marques

.1PT LABEL AFFIXED TO INSIDE OF LID: ' MFD. BY/ INSTRUCTIGRAPH CO./ 912 LAKESIDE PLACE/ CHICAGO, - ILLINOIS/ PATENT NO. 1,725,145' "178" HANDWRITTEN IN PENCIL ON LABEL/ METAL PLATE ON SIDE: '201'/ STAMPED IN [speed] SCALE: 'F 80 S'. LOCKS MARKED "EAGLE LOCK CO./ TERRYVILLE, CONN./ MADE/ IN/ U.S.A."/ PRINTING ON pt BATTERY CASE INCLUDES: 'NO 771 4 1/2 VOLTS/ EVEREADY/ TRADE MARK/ RADIO C BATTERY/ NATIONAL CARBON COMPANY/.../ MADE IN CANADA/ PATENTED/ 1927, 1929,/ 1930, 1931'. pt VACUUMTUBE MARKED "MADE IN/ 30/ CANADA/ GE/ GENERAL ELECTRIC/ RADIOTRON" and "LICENSED ONLY TO EXTENT/ INDICATED ON CARTON".

Manque

METAL COLLAR AROUND CRANK HOLE; PART OF BACK PANEL; ADDITIONAL SPOOLS AND PAPER TAPE; INSTRUCTION BOOKLET [REF 2]

Fini

.1 CASE HAS FAUX BLACK LEATHER COVERING ON EXTERIOR; SHINY SILVER METAL FITTINGS AND SELECTED COMPONENTS; GREEN, BLACK AND RED WOVEN FABRIC COVERING ON CABLES..2-.3 VARNISHED WOODEN SPOOLS HOLD BEIGE PAPER TAPE..4 SILVER METAL CRANK HANDLE HAS TURNED WOODEN KNOB, PAINTED BLACK. PT BATTERY CASING IS OFF-WHITE, WITH BLUE, ORANGE AND BLACK MARKINGS. PT VACUUM TUBE'S CLEAR GLASS SLEEVE HAS BEEN PARTIALLY SILVERED; BLACK BASE.

Décoration

S/O