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During the prevalence of the simoom, particles of fine sand are carried into the atmosphere and obscure the light of the sun. Becoming intensely heated, these particles, by their radiation, increase the temperature of the air, which sometimes rises as high as 120 degrees or 130 degrees Fahr. When powerful winds prevail, dense clouds of sand are carried about in the atmosphere, producing the so-called sand storms. The sand-drifts which are thus formed constantly change their position.

Sand Storm in the Desert

During the prevalence of the simoom, particles of fine sand are carried into the atmosphere and obscure…

"...represents a Savart bell and resonator. The length of the resonant air-column is changed by means of the moveable bottom of the resonator, which is to be adjusted by trial for resonant effect." -Avery 1895

Savart Bell and Resonator

"...represents a Savart bell and resonator. The length of the resonant air-column is changed by means…

"Partly fill two bottles with water. Connect them by a bent tube that fits closely into the mouth of one, and loosely into the mouth of the other. Place the bottle under the receiver and exhause the air. Note and record what takes place. Admit air to the receiver. Note and record what takes place." -Avery 1895

Bottle Siphon

"Partly fill two bottles with water. Connect them by a bent tube that fits closely into the mouth of…

A sneeze is a semi autonomous, convulsive explosion of air form the lungs through the nose and mouth, usually caused by foreign particles irritating the nasal mucosa.

Sick Man Sneezing

A sneeze is a semi autonomous, convulsive explosion of air form the lungs through the nose and mouth,…

"Illustrating the effects of introducing an iron core into a solenoid. In the upper firgure, the air space or 'air core' surrounded by the solenoid offers considerable resistance to the passage of magnetic lines, allowing only a small number to pass through. If a pieve of iron be introduced, as in the lower figure, the number of lines will be greatly increased." -Hawkins, 1917

Effect of a metal core in a solenoid

"Illustrating the effects of introducing an iron core into a solenoid. In the upper firgure, the air…

Robinson's form of Stirling's Engine.

Robinson's Form of Stirling's Engine

Robinson's form of Stirling's Engine.

"The parts are the butt, A; small, B; magazine well, C; barrel bed, D; air chamber, E, which reduces the charring effect og a heater barrel on the stock; small butt plate screw hole and seat for the butt plate tang, F; butt swivel plate seat, G; mortise for receiver tang lug and hole for rear guard screw, H; mortise for sear and slot for trigger, I; cut-off thumb-piece recess, J; mortise for recoil on the receiver, K; bed for fixed base, L; grasping grooves, N; shoulder for lower band, O; bed for band spring, P; shoulder for upper band, Q; channels for decreasing weight, R; upper band screw hole, S; and the stock screw hole, T. The large hole in butt is for decreasing weight, and the smaller one is a pocket for the combination oiler and thong case." — Moss, 1914

Stock, right side view

"The parts are the butt, A; small, B; magazine well, C; barrel bed, D; air chamber, E, which reduces…

"The parts are the butt, A; small, B; magazine well, C; barrel bed, D; air chamber, E, which reduces the charring effect og a heater barrel on the stock; small butt plate screw hole and seat for the butt plate tang, F; butt swivel plate seat, G; mortise for receiver tang lug and hole for rear guard screw, H; mortise for sear and slot for trigger, I; cut-off thumb-piece recess, J; mortise for recoil on the receiver, K; bed for fixed base, L; grasping grooves, N; shoulder for lower band, O; bed for band spring, P; shoulder for upper band, Q; channels for decreasing weight, R; upper band screw hole, S; and the stock screw hole, T. The large hole in butt is for decreasing weight, and the smaller one is a pocket for the combination oiler and thong case." — Moss, 1914

Stock, top view

"The parts are the butt, A; small, B; magazine well, C; barrel bed, D; air chamber, E, which reduces…

"Turbine is, in mechanics, a term formerly confined to horizontal water wheels, the revolution of which is due to the pressure derived from falling water, but now applied generally to any wheel driven by water escaping through small orifices subject to such pressure. The turbine was invented by Fourneyron in 1823, and the first one was made in 1827. Air and steam turbines are also in use, air and steam being used instead of water to drive the impulse wheel."—(Charles Leonard-Stuart, 1911)

Pelton Wheel Turbine

"Turbine is, in mechanics, a term formerly confined to horizontal water wheels, the revolution of which…

"Over the upper end of a cylindrical receiver, tie tightly a wet bladder or sheet of writing paper and allow it to dry. Then exhaust the air. The bladder will be forced inward, bursting with a loud noise. Replace the bladder with a thin sheet of india-rubber. Exhaust the air. The rubber sheet will be pressed inward, and nearly cover the inner surface of the receiver." -Avery 1895

Vacuum

"Over the upper end of a cylindrical receiver, tie tightly a wet bladder or sheet of writing paper and…