Fisher, John

Fisher, John, Practical Pneumatic Conveyer Design. Chemical Engineering, June 2. 1958. 

The corrected melting point is 209.5-210.0°. Melting points were obtained with a Fisher-Johns apparatus. The recrystallized sample retained a pale tan shade... 

The Fisher-Johns apparatus (Fig. 35) is different in that you don t use capillary tubes to hold the sample. Instead, you sandwich your sample be-... 

Corning Drierite Fisher-Johns Luer-Lok Corning Glass Works, Corning, New York W. A. Hammond Drierite Company, Xenia, Ohio Fisher Scientific Company, Pittsburgh, Pennsylvania Becton, Dickinson and Company, Rutherford, New Jersey... 

Instruments Div. (Oak Brook, IL) Fisher-Johns melting point apparatus, Fisher Scientific Company (Pittsburgh,... 

Kofler Micro Hot State Apparatus. Electrically heated apparatus which might be considered a modification and improvement of the Fisher-Johns apparatus. It permits microscopic studies of fusion, sublimation, crystallization and explosion phenomena Refs 1) L. Kofler, Mikrochemie 15, 242 (1934) 2) N.D. Cheronis J.P. Entrikin,... 

In order to determine the firing time of an expl, propint or pyro vs temp of heating, a few grains of sample are placed on die surface of preheated, and maintained at desired constant temperature, devices used for determination of melting point. One of such devices is Fisher-Johns Apparatus [described in Fisher Scientific Co, Pittsburgh ... 

The melting point seems to depend upon the rate of heating. Use of a Fisher-Johns melting-point apparatus gives a value of 240-242°. 

Fisher, John, Pear God and Dread Nought The Correspondence of Admiral of the Fleet Lord Fisher of Kilverstone, 3 vols., ed. Arthur J. Marder, London Jonathan Cape, 1952-9. 

The tin II product shows four peaks (from DSC data)-at 60, 85, 115 and 350 C. The tin IV product shows only two peaks at 85 and 370 C. The sodium ionomer shows peaks at 60, 95, 130 and beginning at 450 C. The pre-ionomer shows peaks at about 40, 90 and 430 C. In all cases, the highest transition appears to coincide with a loss in weight observed in the TGA and the lowest (approximately) corresponds to the softening temperature observed with the Fisher-Johns apparatus. It is believed that the lowest temperature corresponds to movement in the ethylene units and that the additional peaks may correspond to more complex movements involving the carboxylate moieties. 

By comparison, the products derived from monohalo, dihalo and trihalo-organotin reactants exhibit initial softening (both through visual observation utilizing the Fisher-Johns and DSC) in the range of 40 to 140 c. 

Picrates. Melting points over 210° should not be taken of picrates in the usual liquid bath apparatus. Use a melting point bar such as the Dennis bar or a Fisher-Johns apparatus (Ref 88)... 

The product is scraped from the walls of the flask and broken up by means of a curved spatula. The solid is collected on a 12.5-cm. Buchner funnel, washed with two 150-ml. portions of dry ether, dried by suction on the filter for 5 minutes, and stored in a desiccator over sodium hydroxide and phosphorus pentoxide. Analytically pure 2-acetamido-3,4,6-tri-0-acetyl-2-deoxy-a-D-glucopyranosyl chloride is obtained weight 55-65 g. (67-79%) m.p. 127-128° (Fisher-Johns apparatus) (Note 7) typical — NHCOCH3 absorptions at 6.09 n and 6.49 n in the infrared. Evaporation of the mother liquors and addition of ether to the concentrated solution gives an additional 4-6 g. (5-7%) of crystalline product, m.p. 125-127°, that is sufficiently pure for most purposes. The pure product may be stored in an open dish in a desiccator at room temperature for at least 3 years without decomposition (Note 8). 

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