. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 1846.] THE CIVIL ENGINEER AND ARCHITECT'S JOUllNAL. Z67 curate solulion of this problem was at last obtained, and was immpdljitely comnuiuicated lo Professor Cliallis, and iu the following month to ihe Aslrononier-Rojal. Both Professors were therefore iu pos- session of the perfectly complete solution upwards of a jear ago. MOVEABLE JIB CRANES. Remarks or the â utility and defects of the Moveable Jib Crane, according to the construction now generally used in Glas
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 1846.] THE CIVIL ENGINEER AND ARCHITECT'S JOUllNAL. Z67 curate solulion of this problem was at last obtained, and was immpdljitely comnuiuicated lo Professor Cliallis, and iu the following month to ihe Aslrononier-Rojal. Both Professors were therefore iu pos- session of the perfectly complete solution upwards of a jear ago. MOVEABLE JIB CRANES. Remarks or the â utility and defects of the Moveable Jib Crane, according to the construction now generally used in Glasgow, with proposed If/prove- ments to obviate its defects. By William Gale, Glasgow. Head at the Institute of Civil Engineers. (With Engravings, Plate The author's attention having been recently drawn to an examination of the causes of numerous accidents (many of them attended with fatal conse- quences) during the erection of some of the public buildings in Glasgow and the neighbourhood, he found that one of the most fruitful sources of these accidents was the defective construction and injudicious use of the movea'de jib crane. This crane, it may be remarked, has nearly superseded all others used by builders in Glasgow, and is at present employed at most of the pu''ic buildings in course of erection. It has, however, undergone material alterations since its introduction by Francis Watt upon Mr. Ste- venson's works, during the erection of the Bell Rock Ligbth) use ; but while undergoing these modifications and changes to suit convenience, the princi- ple of construction has undergone a change, which has increased the strains to a very considerable extent. As originally constructed, the post or upright a was from 20 feet to 30 feet long, the jib b being of about the same length ; the upright was supported by gye-ropes or chains, similar to the mode usually adopted in quarries; but at present the past is reduced to 15 feet in height, and the jib is extended to 50 feet in l
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