Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
he short arm cannot beover 34 feet long; that is, its vertical height must not exceed this dis-tance; though the short arm may be many times this length, and thelong arm but a small part of 34 feet; it being required, only, that thedischarging arm have a vertical height greater than that of the…
Physics · Astronomy
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