Annual Report - New York State Museum

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University of the State of New York., 1904 - Science
"These reports are made up of the reports of the director, geologist, paleontologist, botanist and entomologist, and museum Bulletins and Memoirs, issued as advance sections of the reports." N.Y. State Museum. Bulletin 66, p. 241.
 

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Page 101 - ... alternating with the red shale, which ceases with this mass. 3d, The gypseous deposit, which embraces the great masses quarried for plaster, consisting of two ranges, between which are the hopper-shaped cavities, the vermicular limerock of Eaton, and other porous rocks.
Page 129 - ... thinner, and many more elongated. The plaster in this state is not capable of uniting with water, but if it is calcined anew, these small crystals lose their transparency and their water of crystallization, and become again a true plaster, as perfect as before. One may in this fashion successfully calcine and recrystallize the plaster, even to infinity, and consequently give to it at will the property of seizing water.
Page 102 - Salina group as follows: Succeeding the Niagara group is an immense development of shales and marls with shaly limestones including veins and beds of gypsum. The general color is ashy approaching drab with some portions of dark bluish green. The lower part is of deep red with spots of green. Succeeding this, where protected from atmospheric influences. the rock is blue like ordinary blue clays, with bands of red or brown. This portion and that succeeding it are often green and spotted, and contain...
Page 130 - Chatelier showed by experiment that evaporation was not necessary and he argued that by taking up of this water the solubility of the hydrate was decreased, and so, on account of the resulting supersaturation, crystallization ensued. "The solution of the hydrate in these experiments is certainly saturated, and all that is needed is something to start the crystallization. From a study of saturated solutions in the laboratory, it is well known that if crystals are introduced into such solutions crystallization...
Page 131 - If the plaster is unburned the gypsum is not reduced to the proper fineness and uniformity, and so would not permit the crystallization to go on in the way it would in the properly burned plaster. But of more importance, the hydrate represented by plaster of Paris would not be formed. "If the plaster is overburned, the plaster will be so completely comminuted that no minute crystals would be left to start the crystallization.
Page 102 - Niagara group is an immense development of shales and marls with shaly limestones, including veins and beds of gypsum. The general color is ashy, approaching drab, with some portions of dark bluish green. The lower part is of deep red, with spots of green. Succeeding this, where protected from atmospheric influences, the rock is blue like ordinary blue clays, with bands of red or brown. This portion and that succeeding it are often green and spotted and contain seams of fibrous gypsum and small masses...
Page 33 - . hydrogen O= " oxygen In this case the amount of carbon, hydrogen and oxygen in the fuel must be known, though the sulfur and nitrogen may be neglected on account of the small amount present in most cases. It will be seen that the only analyses in the tables given above that can be used in calorimetric determinations by this method are those of Irish peat quoted from the Dublin Journal of Industrial Progress. Some authors hold that the heat value of a fuel may be determined more accurately by using...
Page 129 - Survey, vol. 9, 1904 pp. 135-139. " '1. The calcined plaster, on contact with water, unites with this liquid and takes a crystalline form. " '2. The plaster dissolves partially in water, which becomes saturated with this salt. " '3. A part of the liquid evaporates, due to the heat set free in the chemical combination. A crystal is formed and determines the crystallization of the entire mass; a phenomenon which is...

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