. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 30 THE CIVIL ENGINEER AND ARCHITECTS JOURNAL. ! [January allowed ; by this arraiigfment the rack, if meeting wilh any resistance sud- denly m any of tlie pinions in passing them, (tlie momentum of the carnage urging it on), would cause the rack to be pushed up these slots, and thereby getting above the pinions, Cif made sufliciently efl'ective for this purpose) and so enabling it to pass the obstruction without concussion to any part of the apparatus outside the tube. The ope
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 30 THE CIVIL ENGINEER AND ARCHITECTS JOURNAL. ! [January allowed ; by this arraiigfment the rack, if meeting wilh any resistance sud- denly m any of tlie pinions in passing them, (tlie momentum of the carnage urging it on), would cause the rack to be pushed up these slots, and thereby getting above the pinions, Cif made sufliciently efl'ective for this purpose) and so enabling it to pass the obstruction without concussion to any part of the apparatus outside the tube. The operation of this invention, or manuer of its working, is as follows. A pipe or lube, as before described, of sufficient diameter, being laid along in a hollow between the rails of a railway, and being exhausted of air by suit- able means, as arc well known, and hiving the pinions arranged as described at intervals throughout its length ; the piston «ilh its rack attached is placed in this tube in the manner before explained at the farther end from where the air has been, or is being exhausted or withdrawn, the piston rack being in gear with the pinions i/iside the tube ; a railway carriage, having a carriage rack attached to it, as described, being placed upon the rails, as shown in fig. 10, this carriage rack being also in gear correspondingly with the upper part of'the same pinions, that is to say, the relative position of each rack being the same, the piston rack being precisely under, and matching end to end with the carriage rack, (unless, as in the latter plan, the piston rack being longer than the other is a little in advance of it), the one rack cannot then move backwards or forwards without turning the pinions, and these being also in gear with the other rack, that must move also, and in the same direc- tion. Therefore, if the vacuum has such an effect upon the piston that it advances, then will the rack upon the carriage be aflectcd in the same way by and through the m
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