Leaves - simple; alternate; edge toothed. Outline - oval. Apex - pointed. Base - rounded or slightly…
Triangles are made of various substances such as wood, rubber, celluloid, and steel.
Triangles are made of various substances such as wood, rubber, celluloid, and steel.
Triangles are used in drawing lines at right angles to the T-square.
It is possible to draw lines forming angles of 15 and 75 degrees by arranging two triangles.
In some instruments joints are held in position by lock nuts allowing ample movement of the legs, yet…
All lines in a mechanical drawing are made with the aid of an instrument. Horizontal lines are drawn…
"Showing the manner of holding the knife blade on the glass ways, and, by the arrow, the direction of…
"A sliding microtome of simple construction, adapted to cutting all kinds of sections." -Stevens, 1916
"Illustrating how the section knife or razor is drawn across the strop." -Stevens, 1916
"Turn table for cementing coverglasses to slides. For use where the mounting medium is glycerine or…
Early stone implements use by true men during the Reindeer age. These stones include scrapers and points.
Five different reindeer horn. Crafted during the Reindeer age.
Bone points and bone needles. Crafted during the Reindeer age.
Throwing sticks made from reindeer horn. Crafted during the Reindeer age.
Arrow straighteners made from reindeer horns. Crafted during the Reindeer age.
A throwing stick being used by Australian natives. Crafted during the Reindeer age.
Addition, subtraction, and multiplication wheels students use to spin and find the solutions.
In prehistoric times, a woman finds sleeping men from a different tribe and studies them.
In wood working there are a number of fine tools used in cutting wood, in which a single or double shearing…
A lathe is a machine tool which spins a block of material to perform various operations such as cutting,…
A lathe is a machine tool which spins a block of material to perform various operations such as cutting,…
"Screw-punch. a, bed; b, yoke, on the inner sides of which are slides for the cross-head c; d, the punch…
A hex bolt used in carpentry is identified by its hexagonal head and (shown here) fully threaded.
A wood screw with a flat head and slotted drive. Wood screws are unthreaded below the head and designed…
A wood screw with a flat head and slotted drive. Wood screws are unthreaded below the head and designed…
A wood screw with a flat head and slotted drive. Wood screws are unthreaded below the head and designed…
"A handle for holding the threaded die by which the thread is cut on a bar, a nut, or a pipe; a die-stock;…
"Endless screw, a mechanical arrangement consisting of a screw the thread of which gears into a wheel…
"Two pieces of metal placed in a hole in a stone which is to be split a wedge-shaped key or plug being…
"Files. a, cotter-file when large, and verge- or pivot-file when small; b, square file (parallel or…
A typewriter is a mechanical or electromechanical device with a set of "keys" that, when pressed, cause…
A typewriter is a mechanical or electromechanical device with a set of "keys" that, when pressed, cause…
Illustration showing the correct and incorrect position of a right line pen against a T-square, triangle,…
The Scythe was an old method for cutting grass for hay. It was one of the severest labors on the farm.…