. Automotive industries . ly plant two men with the Baird riveter did in thesame time the same amount of work previously done byfour men. Two men with the Baird tool riveted 150automobile frames in an eight-hour day, while previouslyfour men with pneumatic hand hammers could rivet only75 frames in the same length of time. Without specialeffort, eight rivets were set in thirty seconds. By the use of this machine the rivet is headed with asingle stroke or thrust, and there is said to be no vibra-tion attending to loosen joints already made. Each rivetis uniformly headed and completely fills the
. Automotive industries . ly plant two men with the Baird riveter did in thesame time the same amount of work previously done byfour men. Two men with the Baird tool riveted 150automobile frames in an eight-hour day, while previouslyfour men with pneumatic hand hammers could rivet only75 frames in the same length of time. Without specialeffort, eight rivets were set in thirty seconds. By the use of this machine the rivet is headed with asingle stroke or thrust, and there is said to be no vibra-tion attending to loosen joints already made. Each rivetis uniformly headed and completely fills the rivet pressure of approximately 70,000 lb. is exerted on therivet dies. COMMENTING on Sir Henry Fowlers presidential ad-dress before the Institution of Automobile Engineers,The Engineer says he was in high gear all the waythrough it and took the hills and a few distinctly sharpcorners at the same amazing velocity. If after dinnerspeeches were taxed on their horse power, we stand aghastat Sir Henrys R. A. C. Baird pneumatic punch and riveter for automobile frames 902 AUTOMOTIVE INDUSTRIES THE AUTOMOBILE April 2S, 1921 Government Research in RoadConstruction Part II A continuation of the article dealing with the extensive investigationbeing conducted by the U. S. Bureau of Public Roads of factors enteringinto the strength and durability of different types of roads. By P. M. Heldt A SPECIAL investigation was conducted to deter-mine how heavy wheel loads are transmitted tothe subgrade. Several years ago a small pres-sure cell was developed by the Bureau of Public was first used on the Camp Humphreys concreteroad to determine the maximum soil pressure underthe rear wheels of a Class B army truck, which carrya weight of 8500 lb. each. Recently similar tests weremade with a 5-ton, 6-wheel truck, in which the loadof the truck is distributed over four instead of twowheels. Sectional and plan views of the diaphragmcell for determining soil pressure are shown in
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectaeronautics, bookyear
