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Science and research. Mineral prospecting. Chemical prospecting for oil becomes more and more important as the war goes on the demand for oil increases. Petroleum engineers call chemical prospecting the first scientific approach to the detection of oil in the earth. The big glass condensers, with which these engineering students are working with a professor of geophysics are used in a soil analysis test. The percentage of wax left as residue at the end of the experiment indicates the nearness of petroleum to the site from which the soil sample was taken. Colorado School of Mines, Golden, Colorado

Science and research. Mineral prospecting. Chemical prospecting for oi...

Public domain photograph - United States during World War Two, free to use, no copyright restrictions image - Picryl description

Dunbar & Dukate oyster cannery. According to the testimony of a number of the parents and children, this factory reverses the child labor law to suit its own convenience, and probably to avoid detection. Instead of excluding the young children from work before six o'clock according to the law, they let the young children work from four until seven, and then send them home. Location: Biloxi, Mississippi / L.W. Hine.

Dunbar & Dukate oyster cannery. According to the testimony of a number...

Public domain photograph of factory building, free to use, no copyright restrictions image - Picryl description

Bar Harbor, Maine. Civil Air Patrol base headquarters of coastal patrol no. 20. Classes in submarine detection and shipping identification are held each morning after dawn patrol

Bar Harbor, Maine. Civil Air Patrol base headquarters of coastal patro...

Picryl description: Public domain image of a political campaign, group of people, meeting, 1930s, mid-20th-century United States, free to use, no copyright restrictions.

Bar Harbor, Maine. Civil Air Patrol base headquaters of coastal patrol no. 20. Submarine detection class held in the pilots' lounge after dawn patrol

Bar Harbor, Maine. Civil Air Patrol base headquaters of coastal patrol...

Picryl description: Public domain image of a group of people, meeting, conference table, gathering, club, restaurant interior, free to use, no copyright restrictions.

Forest Products Laboratory, Madison, Wissonsin. Dr. R.O. Marts in his laboratory. He is using an Ultropak microscope for the detection of obscure defects in airplane veneer

Forest Products Laboratory, Madison, Wissonsin. Dr. R.O. Marts in his ...

Public domain photograph of laboratory, scientist, free to use, no copyright restrictions image - Picryl description

Bar Harbor, Maine. Civil Air Patrol base headquarters of coastal patrol no. 20. Full safety equipment for one pilot; rubber boat, paddles, seabucket, mending kit for bullet holes "Mae West" life preserver, and dye sack to stain the surrounding water and facilitate detection from the air

Bar Harbor, Maine. Civil Air Patrol base headquarters of coastal patro...

Picryl description: Public domain image of a boat in a harbor, water, fishing boat, free to use, no copyright restrictions.

America's petroleum industries pour out fuel and lubricants for the United Nations. A geologist, employed by one of the important U.S. oil companies, surveys, with the help of his "rod man" standing on the ridge in the background, a section of land to detect the presence of a possible oil deposit under the ground. "Hit or miss" methods of drilling for oil were discarded long ago in the United States. Today careful preliminary surveys and test borings precede the sinking of most oil wells. Geology experts of the important oil companies are able as a rule to read the surface of the ground accurately for the detection of oil deposits. The industry's efficient methods of finding oil have resulted in the enormous amounts of oil produced. According to a U.S. oil company official, the predictable U.S. oil total for the year 1944 will be 1,601,250,000 barrels, a great part of which will supply the armed forces of the United Nations

America's petroleum industries pour out fuel and lubricants for the Un...

Baltimore, MD. Chances of a mechanical error escaping detection are infinitesimal in the Social Security Board Records Office and great care is excercised to guard against human error. After the employee master card has been prepared, and before it is sent on to reproduce an acturial card, indexes, registers and a individual ledger account. It goes to a review section. Here the original application and the master card are brought together and checked for error. Checking is done by a team of two workers, and the few errors which have been made are corrected. Reviews of errors are reduced to a minute part of one perscent. The photograph above shows a part of the review section at work

Baltimore, MD. Chances of a mechanical error escaping detection are in...

Public domain historical photo, free to use, no copyright restrictions image - Picryl description

Bar Harbor, Maine. Civil Air Patrol base headquarters of coastal patrol no. 20. Submarine detection school

Bar Harbor, Maine. Civil Air Patrol base headquarters of coastal patro...

Picryl description: Public domain image of a political campaign, politician, office meeting, 1930s, mid-20th-century United States, free to use, no copyright restrictions.

Science and research. Mineral prospecting. Electrical prospecting for metallic minerals may be carried on by using the dual coil radiometer to measure the electro-magnetic field of the earth, as it may be influenced by the presence of an ore body. Students training for war jobs in the minerals industry, or for service with the armed forces, are shown hunting for ore. A student at the left operates the field generator. The coils about the middles of the two others are made up of many strands of copper wire which act as transformers. The student second from right watches the level on his stationary coil to measure the electro-magnetic field. After completion of training, many students will be given commissions in naval ordnance, where they will use electronics for airplane detection. Colorado School of Mines, Golden, Colorado

Science and research. Mineral prospecting. Electrical prospecting for ...

Public domain photograph of industrial architecture, factory building, free to use, no copyright restrictions image - Picryl description

Bar Harbor, Maine. Civil Air Patrol base headquarters of coastal patrol no. 20. A flyer's safety equipment consists of a folding crash boat folded up in a zipper bag, "Mae West" life preservers, a Very pistol, a flashlight with red lens, and a container of dye to facilitate detection in the water

Bar Harbor, Maine. Civil Air Patrol base headquarters of coastal patro...

Picryl description: Public domain image of a boat in a harbor, water, fishing boat, free to use, no copyright restrictions.

Baltimore, MD. Chances of a mechanical error escaping detection are infinitesimal in the Social Security Board Records Office and great care is excercised to guard against human error. After the employee master card has been prepared, and before it is sent on to reproduce an acturial card, indexes, registers and a individual ledger account. It goes to a review section. Here the original application and the master card are brought together and checked for error. Checking is done by a team of two workers, and the few errors which have been made are corrected. Reviews of errors are reduced to a minute part of one perscent. The photograph above shows a part of the review section at work

Baltimore, MD. Chances of a mechanical error escaping detection are in...

Public domain historical photo, free to use, no copyright restrictions image - Picryl description

$300.00 reward! The subscribers, selectmen of Reading, in behalf of said town, hereby offer a reward of three hundred dollars for the detection and conviction of the person or persons who broke and entered the dwellings of Joseph S. Templ

$300.00 reward! The subscribers, selectmen of Reading, in behalf of sa...

Reward. Available also through the Library of Congress web site in two forms: as facsimile page images and as full text in SGML. Printed Ephemera Collection; Portfolio 75, Folder 17.

Science and research. Mineral prospecting. Intensity of the earth's magnetic field, something a mining engineer needs to know if he is looking for vital metals under the crust of the earth, may be measured by the horizontal magnetometer and the vertical magnetometer shown here. Three engineering students employ geophysical methods, which they will use after they complete their training courses, for war jobs in the minerals industry or commission in the armed forces. Their knowledge will be applied to airplane detection and anti-submarine warfare. Most of the students are now in the enlisted reserve. Colorado School of Mines, Golden, Colorado

Science and research. Mineral prospecting. Intensity of the earth's ma...

Public domain photograph - United States during World War Two, free to use, no copyright restrictions image - Picryl description

$300 reward. The subscribers, Selectmen of Reading, in behalf of the town, hereby offer a reward of three hundred dollars for the detection and conviction of the person or persons who wilfully and maliciously set fire to the stable on Ell

$300 reward. The subscribers, Selectmen of Reading, in behalf of the t...

Available also through the Library of Congress web site in two forms: as facsimile page images and as full text in SGML. Printed Ephemera Collection; Portfolio 76, Folder 34.

Science and research. Mineral prospecting. A ground comparator will reveal the presence of an ore body under the surface of the earth by measuring the total intensity and the plane of polarization of the secondary electro-magnetic field set up by the ore body. These students are using an adjustable coil of copper wire which acts as an electrical transformer, and may be tilted to determine the minimum and maximum intensity of the field. They are conducting an experiment in electronics, taught in the department of geophysics at a famous mining engineering school. They will apply the knowledge they are acquiring to airplane detection and anti-submarine warfare. Colorado School of Mines, Golden, Colorado

Science and research. Mineral prospecting. A ground comparator will re...

Public domain photograph related to electrical equipment, industrial development, free to use, no copyright restrictions image - Picryl description

Bar Harbour, Maine. Civil Air Patrol base headquarters of coastal patrol no. 20. Officer checking the safety gear, which includes a rubber boat, a "Mae West" life preserver, flares, see andho, patching equipment for mending machine gun holes in the boat, a Very pistol, a flash light with red lens, and a dye bag which is broken when in the water to facilitate detection by rescue planes

Bar Harbour, Maine. Civil Air Patrol base headquarters of coastal patr...

Picryl description: Public domain image of a boat in a harbor, water, fishing boat, free to use, no copyright restrictions.

$500 reward. The subscribers, Selectmen of Reading, in behalf of said town, hereby offer a reward of five hundred dollars to any person who shall give information that may lead to the detection and conviction of the person or persons who

$500 reward. The subscribers, Selectmen of Reading, in behalf of said ...

Reward. Available also through the Library of Congress web site in two forms: as facsimile page images and as full text in SGML. Printed Ephemera Collection; Portfolio 70, Folder 19.

$200.00 reward! The subscribers, Selectmen of Reading, in behalf of said Town, hereby offer a reward of two hundred dollars, for the detection and conviction of the person or persons who took seven cases of shoes from the store of Caleb D

$200.00 reward! The subscribers, Selectmen of Reading, in behalf of sa...

Reward. Available also through the Library of Congress web site in two forms: as facsimile page images and as full text in SGML. Printed Ephemera Collection; Portfolio 71, Folder 13.

$500 - reward - $500. The subscribers, selectmen of the Town of Reading, in behalf of said town, hereby offer a reward of five hundred dollars for the detection and conviction of the person or persons who committed an assault on Ho

$500 - reward - $500. The subscribers, selectmen of the Town of Readin...

Printed on yellow paper. Available also through the Library of Congress web site in two forms: as facsimile page images and as full text in SGML. 3 duplicate copies Printed Ephemera Collection; Portfolio 76, F... More

$500 reward. The subscribers, Selectmen of Reading, in behalf of the town, hereby offer a reward of five hundred dollars for the detection and conviction of the person or persons who wilfully and maliciously set fire to the dwelling house

$500 reward. The subscribers, Selectmen of Reading, in behalf of the t...

On verso: MC# 09-82-038.138. Available also through the Library of Congress web site in two forms: as facsimile page images and as full text in SGML. 3 duplicate copies Printed Ephemera Collection; Portfolio 76... More

Constitution and by-laws of the Waterford and halfmoon union society, for the detection of horse thieves. [1865?].

Constitution and by-laws of the Waterford and halfmoon union society, ...

Picryl description: Public domain artwork of horse, equestrian horse riding, free to use, no copyright restrictions image.