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Cement plaster was first introduced in America around 1909 and was often called by the generic name adamant plaster after a prominent manufacturer of the time. The advantages of cement plaster noted at that time were its strength, hardness, quick setting time and durability. [23]
Plaster for hair slabs made with manila hemp fiber broke at 195 lb (88 kg), plaster mixed with sisal hemp at 150 lb (68 kg), jute at 145 lb (66 kg), and goats' hair at 144 lb (65 kg). [ citation needed ] Another test was made in the following manner.
One of the two versions was exhibited at the Centennial International Exhibition in Philadelphia and was awarded a first class medal. [5] Since the Exposition was held in 1876 and the statue in Washington was unveiled in 1875, it is likely that it was the Albany statue or the Albany plaster that was shown in Philadelphia.
In optics, a diffraction grating is an optical component with a regular pattern, which diffracts light into several beams. The first man-made diffraction grating was invented around 1785 in Philadelphia by David Rittenhouse who strung 50 hairs between two finely threaded screws with an approximate spacing of about 100 lines per inch. [28]
This list is incomplete ; you can help by adding missing items. (February 2011) The Thinker in front of the Rodin Museum in Philadelphia This is a list of The Thinker sculptures made by Auguste Rodin. The Thinker, originally a part of Rodin's The Gates of Hell, exists in several versions. The original size and the later monumental size versions were both created by Rodin, and the most valuable ...
Mary Florence Potts (née Webber; November 1, 1850 – June 24, 1922) was an American businesswoman and inventor.She invented clothes irons with detachable wooden handles, and they were exhibited at the 1876 Philadelphia Exposition World's Fair and the 1893 Chicago World's Fair.
Co-invented in 1935 by Charles Richter along with Beno Gutenberg of the California Institute of Technology, the Richter magnitude scale was firstly intended to be used only in a particular study area in California, and on seismograms recorded on a particular instrument, the Wood-Anderson torsion seismometer. [257] 1935 Black light
[2] [3] Ceracchi left for Europe in 1792, and then returned to Philadelphia in 1794. [4] He then had Washington sit for him again in 1795 to finish the marble bust he sculpted while in Italy, copied from the earlier plaster portrait bust he sculpted from life late 1791, early 1792.