. Handbook of construction plant, its cost and efficiency. Fig. 180. operated by being raised with a derrick or elevator. The capacityof this small machine is about six cu. yds. per hour and % per batch. Weight 1,400 lbs., complete. Minimum height12 ft. Price $550. Output of Mixers. On well organized work a batch every twominutes, or 30 batches an hour, should be averaged. The realcapacity of any mixer is usually determined by the speed withwhich the materials are delivered and taken away. In regardto mixer efficiency I can do no better than to quote from Gilletteand Hills Concrete Con
. Handbook of construction plant, its cost and efficiency. Fig. 180. operated by being raised with a derrick or elevator. The capacityof this small machine is about six cu. yds. per hour and % per batch. Weight 1,400 lbs., complete. Minimum height12 ft. Price $550. Output of Mixers. On well organized work a batch every twominutes, or 30 batches an hour, should be averaged. The realcapacity of any mixer is usually determined by the speed withwhich the materials are delivered and taken away. In regardto mixer efficiency I can do no better than to quote from Gilletteand Hills Concrete Construction: The most efficient mixer isthe one that gives the maximum product of standard quality atthe least cost for production. Mr. Chas. R. Gow, in a very complete paper read before theBoston Society of Civil Engineers, gives the cost of concretecrushing, mixing and placing Fig. 181. Portable Gravity Mixer. 424 HANDBOOK OF CONSTRUCTION PLANT This plant is shown in Fig. 182. The engine used was a 40H. P. gasoline engine, but a 25 H. P. was all that the plantrequired. The crusher was a 10x20 in. jaw crusher which wasfed by hand with stone dumped by teams on the crusher gravel and sand were dumped on the platform and shoveledon to an inclined grating which allowed the sand to drop into a34-ft. bucket elevator, while the larger gravel was chuted to thecrusher and thence to the elevator. The rotary screen separatedthe sand and stone into bins from which it dropped to a measur-ing hopper and thence to a skip car. This car was provided with
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbuilding, bookyear191
