... Was it to insure more perfect aim... 
Edgar Rice Burroughs 「The Son of Tarzan」
...No expedition had ever been more carefully planned; everything had been well arranged to insure success...
Samuel White Baker 「In the Heart of Africa」
...They were wanted as hostages during the coming war, and this rude contrivance was adopted to insure their presence...
Richard F. Burton 「Two Trips to Gorilla Land and the Cataracts of the Congo Volume 1」
...This Mr S strongly advised them to do; and to ask for a party of Caffres to accompany the caravan, which would not only insure them safety, but would prove in many respects very useful...
Captain Frederick Marryat 「The Mission; or Scenes in Africa」
...McKim, who had been engineering this important undertaking, deemed it expedient to change the programme slightly in one particular at least to insure greater safety...
William Still 「The Underground Railroad」
...The majority of slaveholders find it necessary, to insure obedience, at times, to avail themselves of the utmost extent of the law, and many go beyond it...
Frederick Douglass 「My Bondage and My Freedom」
...No single individual did more toward laying the foundations of the Tuskegee Institute so as to insure the successful work that has been done there than Olivia A...
Booker T. Washington 「Up From Slavery: An Autobiography」
...He turned back from theFarthest North that had ever been reached by any one, to insure the safereturn of him who was to go to a still Farther North, the very top ofthe world, the Pole itself...
Matthew A. Henson 「A Negro Explorer at the North Pole」
...In order to insure regular payments it was necessary to keep up enthusiasm, which was prone to wane, and Charles consequently became an active and continual preacher of the propaganda of hatred...
Ida B. Wells-Barnett 「Mob Rule in New Orleans」
...A small notch cut in the stay crotch where the end of the trip stick rests will insure the trigger to be released...
A. R. (Arthur Robert) Harding 「Deadfalls and Snares」
...To insure further strength it is advisable to connect the lower ends of the wires by a cross piece of fine wire twisted about each...
A. R. (Arthur Robert) Harding 「Deadfalls and Snares」
...At the exit, the Mistress was forced to leave adeposit of five dollars, "to insure the return of thedog to his bench" (to which bench of agony shevowed, secretly, Lad should never return)...
Albert Payson Terhune 「Lad: A Dog」
...Implicit obediencein trifles will insure it in things of more importance...
Dinks, Mayhew, and Hutchinson 「The Dog」
...No bovine animal should be allowed to go out ofthe defined district alive, and all which enter it should be carefullyinspected to insure their freedom from disease...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
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