Dr. Ralph and Mrs. Olga Crawford Canadian Dental Collection
Category
Dental
Classification
Dental
Accession Number
010020032
Description
Black-enamelled metal air compressor unit; cylindrical air compressor sits on rectangular base atop cylindrical motor with square base; whole unit atop rounded cylindrical base; black rubber band around five-spoked silver metal wheel, attached to compressor base, and smaller wheel, attached to moto…
Black-enamelled metal air compressor unit; cylindrical air compressor sits on rectangular base atop cylindrical motor with square base; whole unit atop rounded cylindrical base; black rubber band around five-spoked silver metal wheel, attached to compressor base, and smaller wheel, attached to motor; black rubber electrical wire coming from base, black and yellow plastic plug at end; silver metal pipe goes from top to air compressor base; black fabric-covered wire goes from motor to air compressor base; broken black rubber wire coming from unit base
Number Of Parts
1
Provenance
Transfer from the Dental Canada Fund; previously housed in the Dentistry Canada Museum (Ottawa).
Printed on unit: "AUTOMATIC AIR COMPRESSOR UNIT // MANUFACTURED BY // THE RITTER DENTAL MFG. CO. // ROCHESTER, NEW YORK, U.S.A. // PAT. NOV 7, 1916 // MAR. 27, 1917 // OTHER PATS PENDING // SERIAL NO. 5832 MODEL -A- // -IMPORTANT- // TO OIL COMPRESSOR, REMOVE THUMB SCREW BELOW THIS NAME PLATE. THEN FILL // WITH COLUMBIA COMPRESSOR OIL THROUGH FILLING HOLE LOCATED ABOVE NAME // PLATE UNTIL OIL FLOWS OUT SCREW HOLE BELOW. POUR VERY SLOWLY // SEE PRINTED DIRECTIONS MADE IN U.S.A.", "AUTOMATIC // MRD CO. // SWITCH // BRITISH PATENT // NO. 16130 OF 19[Illeg.]1"; printed on motor: "THE RITTER DENTAL MFG CO // ROCHESTER, NY // SPECIAL // EMERSON // AIR COMPRESSOR MOTOR // NO. 599862 // VOLTS 110 TYPE 7342 NT // CYCLES 60 AMPS 4.3 // PHASE 1 SPEED 1750 // FOR ALTERNATING CURRENT // PATENTED"; embossed on wheel: "NATIONAL HARDWARE SPECIALTIES LTD // MADE IN DRESDEN ONTARIO CANADA"
Permanent Location
Storage Room W2
W2-536-4-1
Dimension Notes
Length 1.02 m x Width 34.0 cm x Depth 34.0 cm
Condition Remarks
Rubber wires taped together with masking and electrical tape; one wire end is broken off; whole unit is greasy; rubber wires are brittle; enamel chipping heavily around base
Copy Type
Original
Research Facts
Dr Ralph and Mrs Olga Crawford donated their extensive Canadian dental collection to the DCF to create the museum in 1997; further donations were received while Dr Crawford was Curator Emeritus at the Dental Canada Museum until its closure in 2008