LYCOPODIUM POWDER

The Development Process. In the original electrophotographic demonstration, development was accompHshed by dusting lycopodium powder over an exposed sulfur film. This yielded low density images of poor resolution. Considerable powder settied in the exposed background areas (the white areas of a document), and image transfer to paper could only be achieved by prior coating of the paper with wax or another sticky material. 

Returning to Mort s survey, we learn that the first widely recognised version of xerography was demonstrated by an American physicist, Chester Carlson, in 1938 it was based on amorphous sulphur as the photosensitive receptor and lycopodium powder. It took Carlson 6 years to raise 3000 of industrial support, and at last. 

Alpen-mehl, n. lycopodium powder, -ranken, f.pl. Alpranken. alphabetisch, a. alphabetic(al). 

Barka /- shallow vat, back, beck bark, barge. Blirlappi m., -kraut, n. lycopodium, club moss,. faehl, n., -samen, m., staub, n. lycopodium (powder). 

Mooa-pflanzen, f.pl. Boi.) Bryophyta. -pul-ver, n, lycopodium powder. -Starke, /. lichen starch, lichenin. -tierchen, n. Zobl.) bryo-zoan, polyzoan. -torf, m. peat, peat turf, surface peat, -wuchs, m. mossy growth, moralisch, a. moral ethical. 

Lower limits of explosibility of several organic dusts were determined and found to be in general agreement with estimated values [24], Probabalistic aspects of occurrence of dust explosions were studied experimentally with lycopodium powder in relation to dust and hot surface (or dust) temperature. The probability of explosion increases with dust concentration, then falls off, due to the ballast effect of unbumt dust. Probability also increases continuously with the temperature of the hot surface and/or dust particles. Application of the results to practical plant... 

The family is cosmopolitan except for very arid regions it is abundant in tropical and subtropical forests. The spores were formerly used medicinally (lycopodium powder). 

Lanthanide iodide silicides, 200 Lanthanide metals, 200 Lanthanide nitrobenzoates, 200 Lanthanide—transition metal alloy hydrides, 201 Lassaigne test, 201 Lead salts of nitro compounds, 201 Lecture demonstrations, 202 Light alloys, 202 Lime fusion, 202 Linseed oil, 202 Liquefied gases, 203 Liquefied natural gas, 203 Liquefied petroleum gases, 203 Liquid air, 204 Liquid nitrogen cooling, 205 Lithium peralkyluranates, 205 Lubricants, 205 Lycopodium powder, 205... 

Soluble substances like iodine also act as emulsifiers, in the case of ether/water emulsions. Some mixed stabilising agents also act as emulsifiers, e.g., ethyl alcohol and lycopodium powder, acetic acid and lamp black, clay and sodium oleate etc. 

Figure 14. Photometric (a) and polarimetric (b) phase curves for lycopodium powder [14].

Fill the end of a scoop with lycopodium powder and, while holding the scoop about 30 cm above the watch glass, uniformly sprinkle the powder over the surface of the water. The powder layer should be thin—like a layer of dust. 

Gillespie [240] performed similar experiments on wires with aerosols of paraffin, stearic acid, and lycopodium powder. For low-flow velocities, the actual and theoretical quantities of collected dust were in good agreement. As the flow velocity was increased, however, the actual quantity of precipitated dust became considerably less than the theoretical quantity. For wires treated with viscous silicone fluids, the number of particles collected was close to the theoretical, whereas on untreated wires the number collected was approximately half of the theoretical number. Under certain conditions, some of the particles became charged, which favored collection of the particles and better adhesion [239]. 

A compact pile of lycopodium powder burns sluggishly. 

Lycopodium powder (from the tiny spores of a club moss) ignites easily to produce a yellow flame. The powder has a large surface area per volume and burns rapidly in air. 

To do this it is only necessary to sprinkle the surface of the water with a powdered substance having no cohesion with water, and therefore not wetted by it Lycopodium powder is such a substance. Tire powder forms around your hand a true glove, on which the water has no action, any more than it has on the feathers of a live bird. Water runs from it as firom the proverbial duck s back. An even better method is to rub the hand well with the powder instead of sprinkling it on the water. 

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