PROPOSITION IX.
Of the Sticking of Rockets.
THE Stick of a Rocket ought to be seven times the length of the Rocket or more, viz. a Rocket of an Inch and half, six Diameters thereof, the length of the Rocket, is nine Inches, seven
The making of rockets in two parts, the first containing the making of rockets for the meanest capacity, the other to make rockets by a duplicate proposition, to 1000 pound weight or higher / experimentally and mathematically demonstrated, by Robert Anderson.
About this Item
- Title
- The making of rockets in two parts, the first containing the making of rockets for the meanest capacity, the other to make rockets by a duplicate proposition, to 1000 pound weight or higher / experimentally and mathematically demonstrated, by Robert Anderson.
- Author
- Anderson, Robert, fl. 1668-1696.
- Publication
- London :: Printed for Robert Morden ...,
- 1696.
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To the extent possible under law, the Text Creation Partnership has waived all copyright and related or neighboring rights to this keyboarded and encoded edition of the work described above, according to the terms of the CC0 1.0 Public Domain Dedication (http://creativecommons.org/publicdomain/zero/1.0/). This waiver does not extend to any page images or other supplementary files associated with this work, which may be protected by copyright or other license restrictions. Please go to http://www.textcreationpartnership.org/ for more information.
- Subject terms
- Fireworks -- Early works to 1800.
- Cite this Item
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"The making of rockets in two parts, the first containing the making of rockets for the meanest capacity, the other to make rockets by a duplicate proposition, to 1000 pound weight or higher / experimentally and mathematically demonstrated, by Robert Anderson." In the digital collection Early English Books Online. https://name.umdl.umich.edu/A25366.0001.001. University of Michigan Library Digital Collections. Accessed May 8, 2024.
Pages
Page 13
times nine is sixty three Inches, that is five Foot three Inches. The breadth of the Stick at the Head, three quarters of an Inch or less, the thickness half an Inch or less, the small end of the Stick three eighths of an Inch and square, and to be made of light Deal; such a Stick will do very well, and may be counted Custom without Demonstration. In the Winter 1695. there were two sets of Fire works, in the first of which the Wind was North∣ward, and the Rockets in their rising worked into the Wind. In the second the Wind was Westward, and had the same effect as the first; the Reason was because the Stick was to heavy at the upper end, and too light at the lower; and so the Center of Gravity of the Rocket and Stick was too near the Rocket: when in∣deed the Center of Gravity should be in the middle, betwixt the lower end of the Stick and upper end of the Rocket; and to do which the bigger end of the Stick ought to be downward; by this means a lighter Stick would serve, and if the Wind did drive the Rocket, the Rocket would move less, and yet perpendicular to the Horizon. Nature it self has taught us the same; for all Birds, especially Birds of a swift flight, spread their Tails for their Guide. Sticks of Rockets ought to be one
Page 14
to another as the length and Diameters of the respective Rockets; that is, as the Diametre 1½ Inch is to the thickness of its Stick, so is 4 Inches the Diameter of a 4 Inch Rocket to the thickness of its respective Stick. As the length of one Rocket is to its Stick; so is the length of any other Rocket to its Stick: and as the weight of one Rocket is to the weight of its Stick; so is the weight of any other Rocket to the weight of its respective Stick.