Here, for the first time, an “erector arm” was used for placing the segments, which weighed about half a ton.
The erector consisted of a box-shaped frame mounted on a central shaft revolving on bearings attached to the shield.
The principal figures connected with the erector, assuming a water pressure of 5,000 lb.
The erector muscles of the spine (sacrolumbalis, longissimus dorsi and multifidus spinæ) weighed fully 16 lbs.
Like the erector of a pillar, he supports the sky with his smoke; and one of his distinctive epithets is “smoke-bannered.”
The erector spinæ masses are treated by careful finger-tip kneading.
The erector muscles become paralyzed, and the organ remains inactive at the call of the will.
A new form, devised by Mr. Stephenson, acts as an erector, and is very valuable for dissections.
William Murdock, at this time a Boulton and Watt erector, may have suggested this arrangement.
The erector rotating rams were controlled by a similar valve, with four spindles, also operated by a single hand-wheel.
erector e·rec·tor (ĭ-rěk'tər)
A muscle that makes a body part erect. Also called arrector.