NO. 22. 



THE FARMERS CABINET. 



341 



C 1, C 2, are two other vessels, each with 

 a moveable pulley attached, which ascend 

 and descend alternately, each may weigh 

 20 lbs. 



Fig. 79. 



D 



Al 



H 



,J^ 



CI 



Bl 



A3 



D 



B B2 



D D D a rope with one end made fast to 

 one movable vessel C 1, and the other end 

 to the other C 2, and passes over the two up- 

 per fixed pullies A 1, A 2, and is connected 

 with the other movable vessels B 1, B 2, and 

 passes over the two movable pullies attached 

 to C 1, C 2, and under the lower fixed pul- 

 lies A 3, A 4. 



Now suppose a horse attached to the rope 

 at E and moving to F, drawing with a force 

 of 200 lbs., B 2=570 lbs. will be raised to 

 the lower dotted line, and C 2 with the mova- 

 ble pulley will at the same time descend to 

 the upper dotted line, two or throe inches 

 above the lower one, and B 1 will at the 

 same time descend to C 1, and C 1 will as- 

 cend to 11. This calculation allows five per 

 cent, for ihe friction of the pullies, and in- 

 flexibility in the rope, and supposes the horse 

 or other moving power, to pass through thrice 

 the space that each of the vessels B 1, B2, 

 C 1, C 2, does, and also supposes a load of 

 570 lbs. raised and discharged at the highest 

 point from B 1 and B 2, each time that they 

 ascend ; but suppose one of them to ascend 

 and descend loaded, and the other to ascend 

 loaded with 1140 lbs., and descend empty, or 

 increase the moving power to four horses — 

 800 lbs., at a velocity of two miles an hour, 

 and multiply 570 by 4 will give 2280 lbs., 

 raised by each vessel B 1, B2, at each ascent 

 or twice this amount — 4560 lbs., by one of 

 them, when the other ascends and descends 

 loaded. I have given certain specified 

 weights in order to explain the principle, 

 but these may be varied with circumstances, 

 for instance, where the friction is greater 

 than here supposed, the load to be raised may 

 be less, compared with the moving power. 



Chester co , Pa., Smii May, JS37. P. 



For tlie Farmers' Cabinet. | 



The Black Fly. 



In some sections, the black fly, known to 

 our farmers generally, is found extremely 

 troublesome and injurious. I have myself 

 witnessed its bad eflects. A remedy has 

 been proposed in some of the papers. It is 

 to sow a bushel of dry ashes to the acre on 

 vegetables, subject to the inroads of this in- 

 sect. The ashes to be applied while the 

 dew is on, or while the vegetables are moist. 

 The application should be made when the 

 plants are from two to four days old. This 

 top dressing, while it prevents the ravages of 

 the fly, stimulates the growth of the plants. 

 I have tried the experiment for two or three 

 years past with my turnep-field, and invaria- 

 bly with the best success. Should a rain 

 immediately succeed the sowing of the ashes, 

 the application should be immediately re- 

 peated. 



A Bucks County Farmer. 



Extract of a letter to the Editor, from a gen- 

 tleman in Indiana county, Pa., dated. 



May 20, 1837. 

 " A short time since I subscribed for the 

 Farmers' Cabinet, from a desire to sustain an 

 agricultural work published in our State; at 

 the time of subscribing I was unacquainted 

 with the publication, but having lately re- 

 ceived it from the thirteenth number, and 

 finding it one of merit, and worthy of gene- 

 ral patronage, I have interested myself so far 

 as to recommend it to some of my ifriends and 

 neighbors, and as the result of my efforts, I 

 herewith send you the names of thirty sub- 

 scribers, .with payment in advance. You will 

 also please send me the work from the com- 

 mencement, as I wish to preserve it entire 

 for binding. 



I hope that this attempt to establish an ag- 

 ricultural newspaper will be successful. I 

 have long regarded it as a disgrace to Penn- 

 sylvania, one of the first agricultural states 

 in the Union, that no Agricultural Journal 

 was published within her borders. 1 am re- 

 joiced that you have made the effort, and not 

 only so, but that the Farmers' Cabinet, so far 

 as I have examined it, is calculated to pro- 

 mote the interests and welfare of the State, 

 as I hold it to be a true principle that anv 

 plan by which the agriculture of a country is 

 advanced, and its .staple productions increas- 

 ed, tends to benefit the community, both in- 

 dividually and collectively. I regard the 

 " Cabinet" as eminently calculated to ad- 

 vance the interests of agricultural science, 

 and so long as it is conducted with reference 

 to utility, it will afford me great pleasure to 

 recommend it — and I hope that the farmers 

 of Pennsylvania, will give it their cordial and 

 hearty support." 



