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This illustration shows a Surveyor's, or Y-level. In use, the telescope is set perfectly horizontal and pointed back at a rod placed vertically at the starting point. The rod is graduated and after a reading has been taken of the height above the ground cut by the cross wires of the telescope, it is moved to a point forward of the instrument, which is then revolved in a horizontal plane and a reading taken of the rod in its new position. The difference in level is obtained from the difference in readings of the two points, and subsequent readings are taken by removing the level, sighting on the rod in its second position, and then repeating the operation, the readings in this case being recorded.

Surveyor's Level

This illustration shows a Surveyor's, or Y-level. In use, the telescope is set perfectly horizontal…

A printometer-type demand meter arranged in a self-contained case for field tests.

Printometer

A printometer-type demand meter arranged in a self-contained case for field tests.

A term used in botany referring to a case when a collection of hairs unite to form a cup inclosing the stigma of a flower; the scale or shield covering the fruit-spot of the fern.

Indusium

A term used in botany referring to a case when a collection of hairs unite to form a cup inclosing the…

Sharpened drawing pencil for mechanical drawings.

Drawing Pencil

Sharpened drawing pencil for mechanical drawings.

Side view of a hand drawing on a mechanical drawing board.

Hand Drawing

Side view of a hand drawing on a mechanical drawing board.

Tray full of capital and small capital letters and symbols used in the letterpress printing process. Known as the Upper Case.

Letterpress Printing Uppercase Tray

Tray full of capital and small capital letters and symbols used in the letterpress printing process.…

Tray containing the lowercase letters of the alphabet, used in the letterpress printing process. Known as the lowercase.

Letterpress Printing Lowercase Tray

Tray containing the lowercase letters of the alphabet, used in the letterpress printing process. Known…

"for an angel of the Lord went down at certain seasons into the pool, and troubled the water: whosoever then first after the troubling of the waters stepped in was made whole, with whatsoever disease he was holden. And a certain man was there, who had been thirty and eight years in his infirmity. When Jesus saw him lying, and knew that he had been now a long time in that case, he saith unto him, Wouldest thou be made whole?" John 5:4-6 ASV <p>Illustration of Jesus healing a man in one of the five porches at the pool at Bethesda. The lame man is reclining and Jesus is praying over him. Several men, including disciples, stand around and watch the healing. On the other side of a wall, the pool is visible and an angel is hovering over it and reaching a staff down into the waters. A woman with a child waits near the pool. A man walking with crutches wades into the pool. A woman places a baby into the pool in the background.

Jesus Heals a Paralytic Man at the Pool at Bethesda While an Angel Troubles the Waters

"for an angel of the Lord went down at certain seasons into the pool, and troubled the water: whosoever…

"a, is the frame; b, shaft-crank which rocks the hook-shaft; e, receiving its motion from the double crank on the upper shaft e in the arm g through the shaft-connection c; d, band-wheel turned by a band (not shown) from a wheel on treadle-shaft below the table; f, feed-cam; h, feed-bar; i, bobbin-case; j, rotating hook which is attached to e and oscillates with it; k, bobbin-holder; l, presser; m, presser-spring; n, needle-bar link; o, needle-bar; p, take-up lever; q, take-up cam; r, spool-holder...." &mdash;Whitney, 1889

Wheeler and Wilson Sewing Machine

"a, is the frame; b, shaft-crank which rocks the hook-shaft; e, receiving its motion from the double…

"a is the bobbin case; c, bobbin; b, thread wound on bobbin; d, projection from bobbin-case which keeps it from turning; e, thread leading out." &mdash;Whitney, 1889

Bobbin Detail of Wheeler and Wilson Sewing Machine

"a is the bobbin case; c, bobbin; b, thread wound on bobbin; d, projection from bobbin-case which keeps…

"a is the bobbin holder, partly opened to show hook b, and bobbin-case c; d, feed-points; e, presser-foot." &mdash; Whitney, 1889

Bobbin Detail of Wheeler and Wilson Sewing Machine

"a is the bobbin holder, partly opened to show hook b, and bobbin-case c; d, feed-points; e, presser-foot."…

"A cartridge containing shot instead of a bullet, and intended to serve various purposes. a, copper case; b, primer; c, wooden capsule filled with shot; e, powder charge; d, paper partition between the rear end of the capsule and the powder." &mdash;Whitney, 1889

Short Cartridge - Copper Case

"A cartridge containing shot instead of a bullet, and intended to serve various purposes. a, copper…

"A cartridge containing shot instead of a bullet, and intended to serve various purposes. a, paper case to which is fitted the brass base b, with a reinforcement of layers of paper, c, cemented together; d, cloth or felt wads; e, powder; f, shot; g, paper shot-wad, half as thick as one of the wads d; h, primer." &mdash;Whitney, 1889

Short Cartridge - Paper Case

"A cartridge containing shot instead of a bullet, and intended to serve various purposes. a, paper case…

"A forked branch of a tree, four or five feet long, used by slave-hunters in Africa to prevent the slaves they had captured or purchased from running away when on the march from the interior to the coast. The forked part was secured on the neck of the slave by lashings passing from the end of one prong to the end of the other, so that the heavy stick hung down nearly to the ground, or (as was usually the case) was connected with the fork on the neck of another slave." &mdash;Whitney, 1889 <p>In this illustration, the slave sits on the ground with the slave fork out in front of him. He is in an enclosure with a thatched roof.

Slave Fork

"A forked branch of a tree, four or five feet long, used by slave-hunters in Africa to prevent the slaves…