. American engineer . r so that bolts may be put in for handling,and the larger one haMpockcts cored in it for the same wedges holding the dies are secured in place by plates placedover the joints. .\fter the material has been put in place and the proper tup hasbeen set in the guides and the pointers set, the operation of test-ing is done by one man in the testing house as follows: Themagnet is lowered to bear on the tup by reversing the hoistingmotor by means of the controller in the operating house. A fourpoint snap switch is then used. The first point makes connec-tions for ener
. American engineer . r so that bolts may be put in for handling,and the larger one haMpockcts cored in it for the same wedges holding the dies are secured in place by plates placedover the joints. .\fter the material has been put in place and the proper tup hasbeen set in the guides and the pointers set, the operation of test-ing is done by one man in the testing house as follows: Themagnet is lowered to bear on the tup by reversing the hoistingmotor by means of the controller in the operating house. A fourpoint snap switch is then used. The first point makes connec-tions for energizing the magnet only. (The safety hooks go intooperation automatically as the magnet is lowered on the tup.)The hoisting motor is then started and the tup is raised to thedesired height. The switch is then thrown to point 2, whichenergizes the solenoid on the magnet, pulling the safety hooksclear and at the same time de-energizing the magnet, permittingthe tup to drop. Position 3 on the switch is not used, and posi-. Arrangement of Electric Hoist for Drop Testing Maciiine. tion 4 is the off position, furnishing no current to the magnetor hook solenoid. The safetj- hooks on the magnet are made ofaluminum bronze so as not to be attracted magnetically by theforged hooks in the tups when in contact with the magnet. All work except the foundation castings was prepared at theMt. Clare shops of the Baltimore & Ohio, and the designs out-side of the electrical features were prepared by the writer. Theelectrical features were designed b\ R. R. Stabler of the testbureau. Wagon Roads in U. S.—The Secretan,- of Agriculture reportsthat there are in this countrv- 2,210,857 miles of wagon roads,of which onlj 8^ per cent, are improved; but in 1904 only cent, were improved, the increase in the five-year , being miles. The Office of Public Roads, abureau of the department, has during the past year built, atlocal expense, object-lesson roads in 52 places, for whi
Size: 1768px × 1413px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
