|HHCC Accession No. 2006.018||HHCC Classification Code: 7.01-4A|
An early, hydraulic bellows actuated, automatic temperature controls, employing extended capillary tube sensing, and enhanced by manual reset, electric motor overload protection, Ranco, Type D, circa 1935.
One of a series of early, hydraulic bellows actuated, automatic temperature controls, employing extended capillary tube sensing ‘ the preferred sensing technology of the mid 20th century. [See items ID # 142- 151]. The genre would give way by the end of the century to electronic sensing methods.
Image Gallery (4 Images)
7.01 Refrigerating and Air Conditioning Pressure and Temperature Controls - Household
ARCB Co., Columbus Ohio
4 in. long plus capillary line x 1.5 x 3.5 in. high
Exhibit, education, research, and demonstration quality illustrating a significant milestone in the evolution of extended capillary tube technology through a myriad engineering design developments and applications.
From York County (York Region) Ontario, once a rich agricultural hinterlands, attracting early settlement in the last years of the 18th century. Located on the north slopes of the Oak Ridges Moraine, within 20 miles of Toronto, the County would also attract early ex-urban development, to be come a wealthy market place for the emerging household and consumer technologies of the early and mid 20th century.
This artifact was discovered in the 1950’s in the used stock of T. H. Oliver, Refrigeration and Electric Sales and Service, Aurora, Ontario, an early worker in the field of agricultural, industrial and consumer technology.
Type and Design:
Extended capillary tube sensing
- All mechanical mechanism, spring loaded, driven by capillary tube action, beautifully engineered and crafted, a marvel of hand assembly, production line techniques of the period
- Beautifully formed case in high gloss black Bakelite, employing the advanced industial forming methods of the period
External bellows with 12’ capillary line and bulb, charged with methyl chloride [see manual 1058, 1947 for specifications on capillary lines of the period
Control and Regulation:
Targeted Market Segment:
The series [see items ID # 142- 151] profiles the evolution of extended capillary tube technology through a myriad engineering design developments and applications. It was a period driven by, and responding to, a new often shameless, marketing hyperbola. For the industry would take full advantage of knowledge from the newly found thermal and fluid flow sciences of the times, as well as of the new materials technology and manufacturing methods of the immediate pre-W.W.II years.
The industry was clearly out to create ever-increasing consumer interest and expectations for a user friendly, fully automated, self-regulating, affordable, mechanically driven cabinet refrigerators for the Canadian home. It was ‘an automatic refrigerator in every kitchen’ following the marketing pattern set by the automobile industry for ‘an automobile in every garage’, that was the call of the captains of the household refrigeration industry. The perfection of a reliable, affordable, and user friendly, automatic temperature control was critical to the success of this business venture.
- see above
G. Leslie Oliver, The T. H. Oliver HVACR Collection
HHCC Storage Location:
Ranco Manual #1058, Sixth Edition, July 1947
Thermal overload heater plug not included See also ID #143 for customised variant by Ranco sporting polished aluminium escutcheon plate, employing 12 in capillary designed with out control.