attention of mining engineers andcontractors engaged in excavating. A NEW BOTABY ENGINE.Chief among the difficulties which have stood in theway of the production of a successful rotary enginehave been those of providing a satisfactory form ofvalve-gear, steam-ports for the admission and con-trol of… … THE SANDEBSON BOTABY ENGINE. B. C, Canada, shows an ingenious attempt on the partof the designer to overcome these difficulties. Thepiston, B, is fitted steam-tight within the cylinder andis provided at both of its faces with V-shaped cam-shoes, each formed by rods fastened to the pistonand curved…
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