. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 8 BULLETIN 956, U. S. DEPARTMENT OF AGRICULTUEE. >^^~j| It will be seen, therefore, that the test can is firmly attached to the cover of the retort by means of the brass fitting, and the can may be placed in or removed from the retort in a very few seconds by simply putting on or taking off the cover. Owing to the small size of the retort, equilibrium at an}^ steam pressure desired may be attained in 10 to 30 seconds. The top of the mer- cury column is al- ways in sight, and th e temperature a t the center of the co
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 8 BULLETIN 956, U. S. DEPARTMENT OF AGRICULTUEE. >^^~j| It will be seen, therefore, that the test can is firmly attached to the cover of the retort by means of the brass fitting, and the can may be placed in or removed from the retort in a very few seconds by simply putting on or taking off the cover. Owing to the small size of the retort, equilibrium at an}^ steam pressure desired may be attained in 10 to 30 seconds. The top of the mer- cury column is al- ways in sight, and th e temperature a t the center of the con- tainer may be read directly at any time. Figure 1 shows the arrangement of the apparatus and the position of the test can in the retort. THE BRASS FITTING. The accompanying illustrations (fig. 2) show in detail the structure of the spe- cial fitting to which the can is attached for the test. Nu- merous modifications of this are possible, to suit all needs. The original form is shown at A. The threaded stem screws into the cover of the retort until the hex- agonal shoulder presses upon the gasket and forms a steam-tight joint with the retort cover. The threaded portion below the shoulder screws into the hole of the ordinary maximum ther- mometer test can in common use. With suitable gaskets air-tight joints are made, and the can may be attached or removed as desired. Cans of this type were used largely in these investigations. The f-inch hole through which the thermometer is passed is reamed out srem//vr/9/f£ Fig. 1.—Apparatus designed for making time-temperature tests in canning food products, showing the position of the test can in the retort and the arrangement of the long-stemmed thermometer used in taking can tempera- Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. o
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