Applied Aerial Photography |
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accurate acid adjustment Aerial Camera aerial photographs Air Corps FIG aircraft airplane altitude angle apparent horizon Army Air Corps axis bromide camera body chemical chrome alum compass cone constructed contact printing control points copy covered developer distance drying edge elevation emulsion error exposure fixing bath flown flying focal length focal plane glass graph grid gum arabic hydroquinone hypo indicator instrument interval lens lenses level bubble light located lubber line magazine magnetic method metol miles mosaic mount necessary negative object oblique obtained operation ounce overlap pantograph paper parallel picture pilot placed plate or film plotted polyconic projection position possible Potassium Potassium bromide printer prints projection rays reduced removed safety curtain scale shutter side Sodium carbonate Sodium sulphite solution speed spool strip surface survey taken tank tilt tion turn U. S. Army Air vertical photograph vibration view finder washing wind
Popular passages
Page 166 - System The fundamental unit of the metric system is the Meter — the unit of length. From this the units of capacity (Liter) and of weight (Gram) were derived. All other units are the decimal subdivisions or multiples of these. These three units are simply related; eg. for all practical purposes one Cubic Decimeter equals one Liter and one Liter of water weighs one Kilogram. The metric tables are formed by combining the words "Meter...
Page 76 - The ground is observed through the eyepiece, and the vane so rotated around a vertical axis that objects on the ground appear to travel along the wire. The angle of drift is then read on the scale. To obtain the ground speed, the slider is moved along the vane until the cross-wire is at the figure corresponding to the altitude at which the aircraft is flying. Looking through the eyepiece the distance seen on the ground between the two cross-wires is that marked on the side of the vane, either fourtenths...
Page 245 - By Graphical Scale, that is, a drawn scale. A graphical scale is a line drawn on the map, divided into equal parts, each part being marked not with its actual length, but with the distance which it represents on the ground. Thus : IIIII 1 1 1 1 1 1 100 50 0 100 200 300 400 600 600 yards.
Page 180 - Dissolve the cyanide and silver nitrate separately, and add the latter to the former, until a permanent precipitate is just produced; allow the mixture to stand a short time and then filter.
Page 131 - ... the effect caused by the lens bringing oblique rays of light to two focal lines instead of to a single focal point. The result is that it is impossible to get both horizontal and vertical lines sharp at the same time.
Page 163 - Elon, and then add the remainder of the sulphite. 2. Make sure that one chemical is dissolved before adding the next. If the alkali is added before the crystals of the developing agent are dissolved, each crystal becomes oxidized at the surface and the resulting solution will give fog. 3. Mix the developer at as low a temperature as possible. 4. In the case of desiccated chemicals like sodium carbonate and sodium sulphite, add the chemical to the water and not vice versa. Two practical methods of...
Page 129 - The surfaces of a double-convex lens may be considered as made up of an infinite number of small plane surfaces.
Page 116 - A term used to denote the relative movement which takes place between two objects at different distances from the eyes, as the eye is moved from one position to another.
Page 71 - Quickly turn the coil a quarter turn so that the plane of the coil is parallel to the magnetic field. Observe the direction of the induced current. After the galvanometer has come back to zero, rotate the coil another quarter turn and note the direction of the induced...
Page 165 - The advantages claimed for the metric system are : 1. The decimal relation between the units. 2. The extremely simple relation of the units of length, area, volume and weight to one another. 3. The uniform and self-defining names of units.