. Scientific American Volume 64 Number 08 (February 1891) . thevertical bars, while its other end carries a caster backwardly extending bars of the frame havebearings for a crankshaft on which is keyed a sprocketwheel, a chain from which engages a small sprocketwheel on the main axle. Just outside the vertical barsof the main frame, two vertical lever bars are fulcrumedon the axle, a handle piece being secured to the con-nected upper ends of the lever bars, while a rod ex-tends rearwardly from their lower ends to a pivotedlever bar, from which a connecting rod extends towrist pins on
. Scientific American Volume 64 Number 08 (February 1891) . thevertical bars, while its other end carries a caster backwardly extending bars of the frame havebearings for a crankshaft on which is keyed a sprocketwheel, a chain from which engages a small sprocketwheel on the main axle. Just outside the vertical barsof the main frame, two vertical lever bars are fulcrumedon the axle, a handle piece being secured to the con-nected upper ends of the lever bars, while a rod ex-tends rearwardly from their lower ends to a pivotedlever bar, from which a connecting rod extends towrist pins on arms of the crank shaft, whereby, on re-ciprocating the levers by means of the handle piece,the crank shaft is turned and motion is communicatedto the main axle to propel the machine. Extendingforward from the caster wheel bracket, on each side, isa rod passing through a slotted arm secured to theunderside of a pivoted pedal, the rods carrying stops inadvance of the slotted arms, and the forward ends ofthe rods being connected to the forward ends of the. A New Insulating material. A new insulating material for telegraphic or otherelectric lines is thus given by the Revue Industrielle:It is composed of a mixture of gelatine (specially made),resin oil, oxidized linseed oil, resin and paraffin. It ischeap and contains no sulphur. The proportions ofthe mixture are: Glove glue (colle de gant), 1,000 parts ;resin oil, 100 parts ; oxidized linseed oil, 500 parts ; colo-phane,150 parts; paraffin,250 parts. The glue is preparedby taking the refuse clippings of gloves, and soakingthem in cold water for one night. The next day theyare strained and washed in several waters until thewater is clear. In an iron boiler there are then placed1,000 parts of water, five parts of carbonate of soda,and dry glove skin 250 parts. This is boiled for sixconsecutive hours, the water being renewed as it evapo-rates. The whole boiling mass is next run over a sieve,across which steam is passed to prevent t
Size: 1453px × 1721px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubj, booksubjectyellowfever
