Improvements in Naval Architecture, l^'c. 3S7 

 Smnmary of the Experiment, 



BT-i Atuios. air Air after Carb. acid Car;.. ?.cid -t-- 

 ar. Therm. i t- ■ - r i • Tin:e. 



laspirccl. E.<pen:iici;t. luiiinl. [jer mr.iute. 



29-66 3S° 310 3!0 17-05 -68 25 mill. 



Fxpcr'unetit III. y// mospherk Air, 

 The ai>paratus being arranged as liefore, we kept the pig 

 in the slads A tor one liour, and during that time passed 

 1000 cubic inches of" atmospheric air through it, w hich mea- 

 sured loot : portions of the respired gas had been preserved 

 in the mercurial bath, and ihe usnai trials made upon the 

 luixture, which was found to contain 5 pans oF carbonic 

 acid in every 100, or 53 cubic inches in the whole quaniitv ; 

 the azote was unaltered; iOO : 5 :: lOfiO -.53. 



Summary of the Experiment. 



T^i Atmos. air Air after , Carl), acid Cnrb. ricid „. 



arom. 1 nerm. , , Incrc::se. - , . Time, 



liciore expt. expt. Icund. - periiun. 



29-8 56° 1060. lOGl 1 53 -88 1 hr. 



[To be continued.] 



LV. Description of certain I?ive?if ions for the Improvement 

 of Naval Architecture, for incrrasinc; the Coinfoits of 

 ISilariners, and for facilitating Kavd} Enterprisi-s. By 

 Messrs. R. Trevitiiicic and li. Dickinson. 



JL HE inventions alluded to in the above title form the mat- 

 ter of a patent granted to Messrs. Treviihick and Dickinson. 

 They are at the same time so novel, ingeniuus, and useful, 

 that we are persuaded we shall conicr a favour on many of 

 our readers bv giving some of the particulars detailed t)v the 

 patentees in a prospectus which they have circulated among 

 ifi*ir friends. 



I. A ti/r ought- iron moveable Caiison with a Rudder^ for 



Docking a Ship, uhile riding at lu^r AJooriugs, in. any 



Depth of IFatcr, leaving her Keel dry in a Jtw Hours, 



without removing her Slorea or Alasts. 



*' This floating dock is made of wrought-iron, lialfaii 



inch thick, 2.0 feet long, 54 feel wide, and 30 leei dtcp, 



and will wtigh at)oul 400 tons, with a tlanch six feet wide 



on the top, for the workmen to stand upon, and also to 



Btrengihen the caisson. 



" The weitilu of this caisson, when immersed in water, 



Id nearly 350 tons; but, lor reasons mentioned b>:low, it 



B b '2 IS 



