Show SOME RECORDS IN THINNESS platinum wire filament of spiders wab and soap bubble at its it dark spot riall num wire has been drawn ro po fine that pieces of it placed side by side would not cover more than en an inch while hile peces bound together would toe liu necess necessary essay uy to forra form a thread as thick us a a of raw silk A mile of this wire would not weigh more than a grain while seven even ounces ounce of it would intend from london to new york I 1 fine alno as to Is the filament produced by the silkworm that produced by the spider to Is even more attenuated if for instance it a thread of a spiders web measured four miles it would weigh little more than a grain rain As a soap bubble floats in the light of the sun it reflects to the eye an endless variety ot of gorgeous tints tint newton showed that to each of these tints corresponds corr esponda a certain thickness of the substance forming the bubble in tact fact he be showed that all transparent substances when reduced to a certain degree of thinness would reflect these colors near the highest point of the bubble just before it bursts can be seen a spot which reflects no color and appears black according to newton the thickness of the bubble at this black point la is the th part of on n inch |