ve them out of use, notwithstand- the cylinder with a thin sheet of india-rubber to The mechanical engineer who devised these inge- prevent any leakage, and the other a pump oper- ing their elegant appearance and many advantages. nious modifications is satisfied that he has overcome Mr. Wood’s… … inder the lower portion it may be a steel spring) a, HOAGLAND’S PNEUMATIC SPRING. of the latter is enlarged, is ‘securely bolted to the up- thus allowing the india-rubber lining to roll down- spring ; and that, by the adoption of his improve- per leaf of the elliptic spring, , which is secured to…
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