United States. Army Division of Military Aeronautics · leaf 351
n origin for the entire region. The position of an objective is expressed by a number of 4 or 6 figures giving its coordinates with respect to the ori- gin. 113. The first 2 or 3 figures give the abscissa to the nearest hectometer, and the last 2 or 3, the ordinate. The measurements wdthin a… … 114. The designation by coordinates is subject to indi- vidual errors, and may lead to different observers designating different objectives by the same coordinates, or the same objective by different coordinates. For this reason, it is well for the observer to supplement his designation by…
Balloons · Aeronautics, Military
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
![An illustration from [Balloon notes], 1917, leaf 351](https://img.insideoutlibrary.com/img/1024/ia-balloonnotes01unit-351-0.webp)
![An illustration from Abecedario militar : do que o soldado deve fazer te chegar a ser capitaõ, & sargentomór: & pera cada hu[m] delles insolidum & todos juntos saberem a obrigaçaõ de seus cargos, & o modo que teraõ em formar companhias, batalhões, & esquadrões de menor, ou mayor numero de soldados, & como se desfaraõ, & se tirarà a raiz quadra pera os saber formar, & outras cousas curiosas que os affeiçoados a esta arte folgaraõ de saber. Diuidido em dous volumes. (1631)](https://img.insideoutlibrary.com/img/200/ia-abecedariomilita00brit-445-0.webp)
