Renseignements généraux

Nº de série

1206

Nº de partie

1

Nombre total de parties

2

Ou

S/O

Brevets

S/O

Description générale

METAL, GLASS & 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

112,0 cm

Largeur

66,0 cm

Hauteur

138,0 cm

Épaisseur

S/O

Poids

S/O

Diamètre

S/O

Volume

S/O

Lexique

Groupe

Astronomie

Catégorie

Recherche

Sous-catégorie

S/O

Fabricant

Ou

JOYCE

Pays

England

État/province

Inconnu

Ville

Gateshead-on-Tyne

Contexte

Pays

Canada

État/province

Ontario

Période

THIS INSTRUMENT PRESUMABLY USED C. 1960S+. THIS TYPE MFD 1950S-1970S, AND STILL USED IN 1990S +

Canada

PART OF A COLLECTION OF PHYSICS LABORATORY AND CLASSROOM DEMONSTRATION APPARATUS FROM MCMASTER UNIVERSITY. FOUNDED IN 1887 MCMASTER WAS ORIGINALLY A BAPTIST INSTITUTION, AND WAS LOCATED IN TORONTO. IN 1930 THE UNIVERSITY AND ITS STUDENT POPULATION OF 500 WAS MOVED TO HAMILTON, ONT. ( REF. 1)

Fonction

TO MEASURE THE PHOTOGRAPHIC DENSITY OF SPECTRAL LINES ON A NEGATIVE WHICH ARE TOO FAINT TO BE SEEN WITH THE NAKED EYE.

Technique

JOYCE LOEBL, BASED IN THE NORTH EAST OF ENGLAND, BUILT 1000S OF MICRODENSITOMETERS DURING THE 1950S- 1970S, AND THEY WERE SOLD AND USED WORLDWIDE. MICRODENSITOMETERS WERE THE LAST PRE-COMPUTER DEVICES FOR SPECTRAL ANALYSIS: THEY WERE REPLACED IN THE 1970S BY SCANNING DEVICES CONTROLLED BY A PDP COMPUTER. THE MICRODENSITOMETER IS CONSIDERED BY MANY TO BE THE MOST PRECISE INSTRUMENT FOR THE MEASUREMENT OF GREY SCALE ON PHOTOGRAPHIC EMULSIONS. (REF. 2)

Notes sur la région

Inconnu

Détails

Marques

"JOYCE/ LOEBL" plate appears on control panel; all controls, etc. labelled. Handwritten labels also on control panel reads " TURN SUPPLY/ ON FIRST/ leave 10 min./ (THEN LAMP)/ TURN LAMP/ OFF FIRST/ (THEN SUPPLY) ". Plate on left side panel reads " DOUBLE-BEAM RECORDING/ MICRODENSITOMETER/ MK III CS SERIAL NO.1206/ MADE BY/ JOYCE, LOEBL & CO.LTD./ ELECTRON HOUSE,/ PRINCESWAY, TEAM VALLEY,/ GATESHEAD-ON-TYNE, II./ ENGLAND ". Orange decal, beside, reads " ontario hydro/ electrical/ approval/ by special inspection series A ". Small plate on instrument bed reads " THIS INSTRUMENT IS MADE UNDER/ LICENCE FROM N.R.D.C AND COVERED/ BY PATENT NO. 15764/54 ". Optical lens suspended over bed marked " X10/.17 " and "X10 BECK ". Optical lens recessed in bed marked " VICKERS 3/0.1 " and " S3917 ". Paper label taped to side of microdensitometer reads " STORAGE NO.:------- DATE: Oct. 28/81 / ITEM: Joyce Loeble [sic] & Co. microdensitometer/ S/N: 1206 MODEL: Mk. III CS/ STATUS storage/ REPAIR $ ? / RESEARCHER: from 3N3/ OTHER: ---------- ". Inventory decal on instrument reads " MCMASTER/ HEALTH SCIENCES/ OP5-301-723-FHS/ [barcode]/ *A005868* ".

Manque

UNKNOWN: THIS MACHINE MAY HAVE BEEN MODIFIED.

Fini

SMOOTH GREEN-GREY ENAMEL FINISH; SOME BLACK AND SILVER METAL COMPONENTS AND FITTINGS

Décoration

S/O