The Portland Pudgy safety dinghy is a self-rescue boat, even without the optional inflatable exposure canopy and other survival gear. With the exposure canopy, sea anchor, and sail kit, the Portland Pudgy is an unsinkable, dynamic lifeboat.
The âlead pencil,â containing no lead, was invented in 1564, a turning point in pencil history. Although civilizations were centuries away from making mechanical pencil history, the pencil invented in the sixteenth century advanced the writing instrument. Before 1564, artists mainly used stylus-like pencils. The history of the pencil owes a dept to the discovery of a graphite mine in Cumbria, England.
Some pencils (like carpenterâs pencil) were sharpened with knife even after that because they are flat and cannot be sharpened with rotating motion. In 1828, French mathematician Bernard Lassimonne patented the first pencil sharpener. This sharpener had small metal files set at 90 degrees in a block of wood and it grinded the edges of the pencilâs tip. This method wasnât any faster or easier than sharpening with a knife so it didnât became popular.