Search results
Results from the WOW.Com Content Network
Gel pens. Compared to other inks, gel ink has higher melting point viscosity, which supports a higher proportion of pigments in the medium.The pigments are typically copper phthalocyanine, carbon black and iron oxides, and the gel is made up of water and biopolymers, such as xanthan gum and tragacanth gum, as well as some types of polyacrylate thickeners.
A medical mercury-in-glass maximum thermometer showing the temperature of 38.7 °C (101.7 °F). One special kind of mercury-in-glass thermometer, called a maximum thermometer, works by having a constriction in the neck close to the bulb. As the temperature rises, the mercury is pushed up through the constriction by the force of expansion.
A luxury pen. A pen is a common writing instrument that applies ink to a surface, usually paper, for writing or drawing. [1] Early pens such as reed pens, quill pens, dip pens and ruling pens held a small amount of ink on a nib or in a small void or cavity that had to be periodically recharged by dipping the tip of the pen into an inkwell.
Lead shielding refers to the use of lead as a form of radiation protection to shield people or objects from radiation so as to reduce the effective dose. Lead can effectively attenuate certain kinds of radiation because of its high density and high atomic number ; principally, it is effective at stopping gamma rays and x-rays .
The first patent for a ballpoint pen [6] [7] was issued on 30 October 1888 to John J. Loud, [8] who was attempting to make a writing instrument that would be able to write "on rough surfaces—such as wood, coarse wrapping paper, and other articles" [9] which fountain pens could not. Loud's pen had a small rotating steel ball held in place by a ...
A combination of pen spinning tricks. Pen spinning is a form of object manipulation that involves the deft manipulation of a writing instrument with hands. Although it is often considered a form of self-entertainment (usually in a school or office setting), multinational competitions and meetings are sometimes held. [1]
The earliest known split-nib metal dip pen is a surviving copper-alloy pen found in Roman Britain (AD 43 to 410). [4] Several other surviving all-metal and removable-nib pens from the Middle Ages and Renaissance have been found, suggesting they were used alongside quill pens. [5] [6] [7] [8]
In 1891, a New York City tattoo artist Samuel O’Reilly repurposed the electric pen’s design to be used as the first electric tattoo needle. [1] [7] What was previously done by hand was now done much faster thanks to this revolutionary device. Around this time, tattoos started to rise as a cultural phenomenon thanks to their popularity among ...