244 THE ANALYST. APPARATUS. Apparatus for the Continuous Registration of the Results of Gas Analysis and Precipitation in Liquids. (Chenz. Zeit., 1906, XXX., 347.)-B. Stollberg has patented (in Germany).the apparatus shown in the figure. It consists essentially of a number of flasks, containing suitable re- agents, connected with each other and mounted on separate pendulum - balances, which rotate graduated paper discs at speeds corresponding with their weights. On these discs a pencil worked by clock-work marks off minutes. By mean$ of a pump (not shown) worked by a falling-weight mechanism determined quantities of the gas (from a chimney, etc.) to be analysed are drawn through the flasks, and the increase in weight of each flask in a given time is read off from the discs. By means of suitable modifications the apparatus may also be made to give a continuous record of the specific gravity of a liquid, the amount of suspended or precipitated matter in it, and the like.A. G. L. Modified Westphal Balance for Solids and Liquids. F. M. Williams. (Jozmz. Arne?*. Chem. Xoc., 1906, xxviii., 165-187.)-The balance is adapted for solids, particularly cements and minerals, by lengthening the pointer, upon which, at a distance equal to the length of the other arm, is suspended a support carrying two pans, one above, the other below, the surface of the liquid, by means of which the object may be weighed first in air, then in the liquid. A two-piece counterpoising weight movable along the threaded portion of the pointer facilitates adjustment, and a cam device for raising the beam and locking it in place tends to prevent wear uponTHE ANALYST.245 the knife edges. The insertion of a hinge-joint in the upright standard arm allows - - the instrument to be folded up within a small space. W. H. A Burette Top for the Absorption of Carbon Dioxide and other Gases (Chem. Ztg., 1906, xxx., 459).-Gustav RIuller, of Ilmenau, has devised the apparatus shown, which is designed to prevent the absorption of carbon dioxide by caustic alkali solutions in the burette. The apparatus fits in the top of the burette, which is widened to admit it, by means of a ground- glass joint. It contains a solution of caustic alkali, through which any air entering the burette has to bubble, the path of the air being shown by the arrows.A piece of solid potash may also be placed in the bulb (d). I n filling a burette for the first time with the standard solution, the apparatus is placed on the top of the burette and filled with potash. It is then turned so that a groove (f) at the ground-glass joint is opposite a hole (9) in the burette. The standard solution is then run in from below, the air from the burette escaping through (9). The top is then turned so as to shut off cornmunication between (g) and (f), and kept in this position. Any air entering the burette has then to bubble through the potash, whilst in filling the burette afresh the potash is simply forced up into the bulb (d). A New Electrolytic Apparatus. S. F. Acree. (Anzer. Chern. Journ., 1906, vol. 35, pp. 313-316.)-The essential feature of the apparatus is that by means of a rotating, propeller-like anode all the liquid is continually circulated through the 4 n cathode K, which is of platinum gauze, 50 meshes to the linear inch, and consists of an outer ring 2.5 inches in diameter, forming one piece with the arm G, and an inner removable ring which holds the gauze in position, the two rings being kept firmly together either by fine platinum wire or by four small drops of gold.The arm G is held in position by a binding-screw attached to the glass rod F, and supports K half an inch above the bottom of the beaker H. A glass cylinder, I, rests on the outer ring of K, its upper edge being at least 8 quarter of an inch beneath the surface of the liquid. The anode J, of heavy platinum foil, is riveted to the platinum rod E, which is sealed into the glass tube C, and the latter rotated in the glass tube B by means of a pulley, A, and a Rabe water turbine or a small electric motor.A platinum strip or stout wire, D, connected to a binding-screw on F brushes against E, making good contact. The distance between J and K is adjustable, and depends entirely upon the voltage and strength of current required. -.,,, -'I W. H. S.246 THE ANALYST+ New Form of Potash Bulbs for Estimation of Carbon Dioxide from Combustions. S. F. Acree. (Amer. Chenz. Jozmz., 1906, vol. 35, pp. 309-311.)- A modification of Soxhlet’s alkali apparatus, in which the two bulbs B and D are filled and surrounded with glass wool saturated with 50 per cent. KOH solution, the mixture of gases from the combustion- tube being thereby brought in contact with a very large surface of alkali solution, insuring almost perfect absorption.The glass wool around the bulbs is kept in position by four small glass projections E, which extend from the lower bulb nearly to the wall of the outer vessel, and the exit tube from the lower bulb dips into the potash solution F. A calcium chloride tube is attached by means of a ground-glass joint at A. The efficiency of the apparatus is proved by the fact that on passing through two of them in series ( a ) a stream of nearly pure CO, for fifteen minutes, ( b ) a mixture of one-third CO, and two-thirds air, in neither case was the amount of CO, absorbed by the second apparatus as much as 0.10 mgm. Porcelain-lined Bomb for General Laboratory Use.S. F. Acree. (Amer. Chewa. Jown., 1906, vol. 35, p. 309.)- The bomb E is of soft steel, about Q inch thiok, and tested to 250 atmospheres water pressure, its entire inner surface up to the threads at the neck being lined with white porcelain -& inch thick, which may be of acid or of alkali-proof material. The stopper B is of hard bronze, has a square head, and screws into the neck of the bomb with heavy threads, the ring C, of very hard rubber or lead, making a gas-tight joint. The handle I, attached to the screw A on a square head, serves as a valve, the screw fitting into the stopper with gas- tight threads and packing, and having a tip, D, of very hard rubber or lead, which closes the bomb so tightly that liquid carbon dioxide cannot escape.The inlet or outlet G has a cap, and is threaded to fit carbon dioxide cylinders. The bomb rests in 8 detachable ring base, H. w. H. s. W. H. S. Dougal Assay Tube.-This, which is a modified flask, will be found useful for “part- ing,” dissolving metals, minerals, etc., solution proceeding quietly, as the double opening pro- vides a free escape for the evolved gases. The apparatus may be obtained from Messrs. J. J. Griffin and Sons. W. J. S.THE ANALYST. 247 A New Rheostat for Electrolytic Analysis. G. Pascalis. (Mon. Xcieizt., 1906, 4 Ser., 20, 168; through Chenz. Zeit, 1906, xxx. [Itep.], 104.)-The small adjustable resistance shown in the figure on the top of the electrolytic stand has been designed by the author in conjunction with GrBsy. Its height is only 80 to 100 mm., the diameter being 50 to 60 mm. A casing protects it from fumes. By means of the screw on the top the strength of a current at 4 to 6 volts may be regulated from 0 to 1 ampitre in -& ampAre stages. A. G. L. Struthers Syphon Pipette possesses the following advantages-compactness, less danger of liquid pipette being sucked up into the mouth, no necessity for using tip of finger in stopping flow, mark more exactly and easily caught, easy regulation and stoppage of flow, which is effected by simply tilting the pipette; it always discharges the same volume, as the bulb completely empties itself. The pipette is manufactured by Messrs. J. J. Griffin and Sons. W. J. S.