Rudimentary treatise on the construction of cranes, and machinery for raising heavy bodies, for the erection of buildings, and for hoisting goods / By Joseph Glynn.

  • Joseph Glynn
Date:
1849
Catalogue details

Licence: Public Domain Mark

Credit: Rudimentary treatise on the construction of cranes, and machinery for raising heavy bodies, for the erection of buildings, and for hoisting goods / By Joseph Glynn. Source: Wellcome Collection.

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    horses’ power. The number is in each case obtained in the following manner. Take the first experiment. Here 1050 lbs. were raised 163 ft. high in 90 se- conds; this is equivalent to (1050 * 16. 6 =z) 17325 Ibs. raised 1 foot high in 90 seconds, which is equiva- lent to (17325 1:5 =) 11550 Ibs. raised 1 foot high in one minute. In this case the man’s power is equal to 11550, and the same calculations being pursued in the other cases, give the numbers constituting the last column in the fol- lowing table. TABLE. a a é 3 3g f 2 Mar a 33 Blew ag ag REMARKS. Barer 3) = 2.5 9 Y vs ee Pp asa ‘2 BS as Ze | aes | BE |An |e I. 10 | 1050 | 90|1:5 |Easily by a stout Englishman] 11550 II. 15 | 1575 | 135 |2:25|Tolerably easily by the same man. 11505 Iti. | 20 | 2100 | 120\2 ie on by a sturdy Irish- 17325 IV. 25 | 2625 | 150 |2'5 With difficulty by a stout Englishman . . 17329 v. 30 | 3150 | 150 |2°5 | With difficulty by a London fo ae 20790 VI. 35 | 8675 | 182 |22 | With the utmost difficulty by atall Irishman . .| 27562 2) a ae ... | 150/25 |With the utmost difficulty by a London man. Same as Experiment V. . 242.55 VERE cE se ... | 170 |2:83 | With extreme labour by a tall Irishman . | 21427 IX. Bd ... | 180/38 | With very great exertion by a sturdy Irishman. Same as Experiment Hl. . . .| 20212 X. se ... | 243 |4:05 | With the utmost exertion bya Welshman. . . .| 15184 XI. veg ye 35| 0 |Given up at this time by an Irishman. ¢ er2