Cool Home Security images

April 3, 2019 - Comment

Some cool home security images: Image from page 143 of “Practical preventive medicine” (1920) Image by Internet Archive Book Images Identifier: practicalprevent00boyd Title: Practical preventive medicine Year: 1920 (1920s) Authors: Boyd, Mark F. (Mark Frederick), 1889-1968 Subjects: Preventive Medicine Public Health Publisher: Philadelphia and London, W. B. Saunders company Contributing Library: Columbia University Libraries Digitizing

Some cool home security images:

Image from page 143 of “Practical preventive medicine” (1920)

Image by Internet Archive Book Images
Identifier: practicalprevent00boyd
Title: Practical preventive medicine
Year: 1920 (1920s)
Authors: Boyd, Mark F. (Mark Frederick), 1889-1968
Subjects: Preventive Medicine Public Health
Publisher: Philadelphia and London, W. B. Saunders company
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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Text Appearing Before Image:
WATE.R BEARING■V-.SAND Fig. 44.—Showing how pollution may enter an improperly located and poorlyconstructed well. Most contamination of wells enters from the top. Note thedrainage toward the well. {Minn. State Board of Health.) from sewers, privies and cess pools. Underground contamina-tion may occur in clayey or gravely soils or in limestone regions,owing to the fissured or open character of the sub-soil. Shallowwells are frequently contaminated. 10. Emergency Protection in the Home.—The various do-mestic filters are of little value, as in order to give satisfactoryresults they must be cleaned frequently, at least daily, and it 10 146 PRACTICAL PREVENTIVE MEDICINE is rare for them to receive this care. They are apt to give afalse sense of security. Boiling drinking water from 15 to 20 minutes is one of thebest emergency safeguards that can be employed. Anothermethod of equal value is the employment of bleach or chlori-

Text Appearing After Image:
WATER BEARING^SAND OR GRAVEL Pig. 45.—Showing how a well can be protected against pollution. (Minn. State Board of Health.) nated lime. A stock solution of bleach is made by adding oneteaspoonful of fresh chlorinated lime to a pint of water. • This isadded to the drinking water in the proportion of one teaspoonfulto ten gallons, or nine drops to one quart, and allowed to actfor 15 to 30 minutes before the water is consumed. REFERENCES Race: Chlorination of Water. Stein: Water Purification Plants and Their Operation. WATER PURIFICATION 147

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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 work.

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