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"We may test other solutions by arranging the following circuit, including a source of current, the substance to be tested, and some instrument to detect the passage of the current." -Brownlee 1907

Conductivity Test

"We may test other solutions by arranging the following circuit, including a source of current, the…

Germination test of different ears of corn.

Germination Test

Germination test of different ears of corn.

"Testing the insulation resistance of a motor or generator from its winding to ground." —Croft 1920

Measure Insulation Resistance of Motor

"Testing the insulation resistance of a motor or generator from its winding to ground." —Croft…

"Now when Job's three friends heard of all this evil that was come upon him, they came every one from his own place: Eliphaz the Temanite, and Bildad the Shuhite, and Zophar the Naamathite, and they made an appointment together to come to bemoan him and to comfort him." Job 2:11 ASV <p>Illustration of Job sitting on the ground, against a wall, head covered and bowed. Three of his friends sit across from him. One is speaking with his right arm raised, finger pointing skyward. Another rests his head on his fist and a third looks intently at Job.

Job is Patient as His Friends Bemoan Him

"Now when Job's three friends heard of all this evil that was come upon him, they came every one from…

A man sitting at a desk, with a boy standing in front, with his eyes closed.

Man at desk and boy

A man sitting at a desk, with a boy standing in front, with his eyes closed.

A woman mixing milk with acid to test it, using a rotary motion with the bottle not pointed towards her face.

Mixing Milk

A woman mixing milk with acid to test it, using a rotary motion with the bottle not pointed towards…

A woman putting milk into a test bottle. The pipette is held at an angle with the test bottle and its point against the inside of the neck.

Testing Milk

A woman putting milk into a test bottle. The pipette is held at an angle with the test bottle and its…

"And Simon Peter answered and said, Thou art the Christ, the Son of the living God. And Jesus answered and said unto him, Blessed art thou, Simon Bar-jonah: for flesh and blood hath not revealed it unto thee, but my Father who is in heaven." Matthew 16:16-17 ASV <p>Illustration of Peter kneeling before Jesus. Jesus is telling Peter that he will build his church upon Peter and Peter will have the keys to heaven. Jesus is handing Peter a key with a cross on it. Six other disciples are standing to the side, watching. The dome of St. Peter's Basilica glows in the distant background. This scene is commonly referred to as the Confession of Peter.

Peter Publicly Professes that Jesus is Christ, the Son of God

"And Simon Peter answered and said, Thou art the Christ, the Son of the living God. And Jesus answered…

"A proof-plane may be made by cementing a bronze cent or a disk of gilt paper to a thin insulating handle, as a glass tube or a vulcanite rod. Slide the disk of the proof-plane along the surface of the electrified body to be tested, and quickly bring it into contact with the knob of the gold-leaf electroscope, the leaves of which will diverge." — Avery, 1895

Hand with Proof-plane

"A proof-plane may be made by cementing a bronze cent or a disk of gilt paper to a thin insulating handle,…

A piece of embroidery or needlework produced as a demonstration or test of skill. This sampler includes the alphabet, as well as the student's name and age. These pieces often include figures, motifs, and decorative borders.

American Sampler

A piece of embroidery or needlework produced as a demonstration or test of skill. This sampler includes…

Sea-stars are Echinoderms. The order Ophiuroides is closely related to starfishes. The arms of sea stars however, differ from those of starfishes in not containing any prolongations from the stomach.

Sea-star

Sea-stars are Echinoderms. The order Ophiuroides is closely related to starfishes. The arms of sea stars…

Sea-urchins are Echinoderms. Their shell is mainly composed of calcareous plates.

Sea-urchin

Sea-urchins are Echinoderms. Their shell is mainly composed of calcareous plates.

"Tenacity is that property of matter by virtue of which some bodies resist a force tending to pull their particles asunder Its measure is the ratio between the breaking weight and the area of the cross section of the body broken. It varies with different substances, with the form of the body, with the temperature, and with the duration of the pull." -Avery 1895

Testing for Tenacity

"Tenacity is that property of matter by virtue of which some bodies resist a force tending to pull their…

A test tube

Test tube

A test tube

"The Actual Size of the Test Type, which shiykd be seen by the Normal Eye at a distance of Twenty Feet." &mdash; Blaisedell, 1904

Test type

"The Actual Size of the Test Type, which shiykd be seen by the Normal Eye at a distance of Twenty Feet."…

A handy testing set.

Testing Set

A handy testing set.

This illustration shows a vacuum boiler in which liquid to become glue is boiled by steam, as well as a man testing the liquid in the manufacturing process.

Vacuum Boiler, Testing the Liquid (Glue)

This illustration shows a vacuum boiler in which liquid to become glue is boiled by steam, as well as…

A portable combination volt-ammeter for testing.

Volt-Ammeter

A portable combination volt-ammeter for testing.