Hand book of calculations for engineers and firemen : Relating to the steam engine, the steam boiler, pumps, shafting, etc. . U Fig. scrieve the lath and blade, shift it to the following edge ata point on the blade exactly opposite where the first pop wasput, scrieve the blade and lath again. The distance between Hand Book of Calculations. 303 FINDING THE PITCH OF A PROPELLER. the marks on the lath Y (- is piece of the pitch ; on the blade,E F piece of the thread : square each of these, and subtractone result from the other ; now extract the square root of re-mainder, and this will giv
Hand book of calculations for engineers and firemen : Relating to the steam engine, the steam boiler, pumps, shafting, etc. . U Fig. scrieve the lath and blade, shift it to the following edge ata point on the blade exactly opposite where the first pop wasput, scrieve the blade and lath again. The distance between Hand Book of Calculations. 303 FINDING THE PITCH OF A PROPELLER. the marks on the lath Y (- is piece of the pitch ; on the blade,E F piece of the thread : square each of these, and subtractone result from the other ; now extract the square root of re-mainder, and this will give piece of circumference : take thecircumference of the propeller at the place where the measure-ments were taken, and make a proportion as follows : As piece of circumference : whole circumference : : pieceof the pitch : whole pitch. Answer. The above may he made clearer to some by the following :A c : C : : p : P. : f r Fig. 135. A left-handed propeller is a screw with a left-handed thread,and a right-handed one has a right-handed thread ; therefore,a left-handed propeller to move the ship ahead goes from rightto left, and a right-handed propeller turns from left to right:looking from tin- stern of tin- ship to the engine room andngines passing the top centre. THE SLIDE VALVE. withstanding its extreme -implicit} as a piece of mechan-ism, no pari of the engine is more puzzling to the average en-gineer in those questions relating to the lap and lead best to en it. tin-amount , the proper point of cut- <?.. hence the following date is introduced to aid thestudent in acquiring the first points necessary to be known inpractice. It is oearlj always a matter of years of study and ation before one becomes familiar with the subject. 304 Hand Book of Calculations. Putting an Engine on the Centre. Place the engine in a position where the piston will have verynearly completed its outward s
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