display and a selector switch, or with multiple displays; significant digits remain
coherent at operating speeds; and absolute accuracy is quickly restored after
stoppage of motion.
H. DELL FOSTER COMPANY.
The H. Dell Foster Company, San Antonio, Texas, USA, has produced
the Remote Sensing System (RSS) consisting of a numerical rectifying enlarger
(RSS-200), a stereoplotter (RSS -300), and a graphic quantizer (RSS-400).
a. The RSS-200 is a numerically controlled photogramme trie rectifier
with digital positioning system controls. An internally built-in computer posi
tions all the elements of rectification by means of incremental stepping motors.
Actual positioning is checked and displayed and prints are exposed in the instrument.
b. The RSS-300 is an anaglyphic, projector-type instrument capable of
accommodating from two to five projectors of varied focal lengths. Granite
plotting surfaces vary through a large range. A Fugi Hypergon lens is used.
c. The RSS -400 is a digital, graphic coordinate measuring and display
system with a programmed data storage and transfer capability. An electronic
control console is used to carry out semiautomatic quantizing of the X, Y, Z;
or Y, Z, and other variable and coded data from photogrammetric and mechani
cal positioning instruments. Data scanning controls and other counting, storing,
reading, and amplifying elements utilize solid state electronics. Silicon inte
grated logic circuits are used as well for high precision operations. Provision
is made for interface with miscellaneous devices including an on-line computer;
various recording elements such as typewriters, tapes, line printers, and card
punchers; and other items such as electronic scalers, digital planimeters, cir
cular interpolators, and coordinate drafting machines to mention but a few.
Complete buffer (temporary) storage of all counters and signs provides data
transfer capabilities at high speeds. The mechanical coordinatograph provided
has a large working area.
THE KELSH INSTRUMENT COMPANY, INC.
The Kelsh Instrument Company, Inc., Baltimore, Maryland, USA, has pro
duced several new versions of the original Kelsh Plotter. These are discussed below.
a. The Kelsh Plotter, Model 5030, can be adapted to photographs taken
from various aerial cameras and can handle convergent photography. Basically,
it is designed for standard wide-angle photography with either five- or seven-
diameter working models. Corrector cams to compensate for lens distortion,
pantograph, finger-tip light voltage control, and leveling micrometers are
additional features.
b. The Kelsh Plotter, Model KPP-3, is similar to the standard version
referred to above, but is capable of utilizing three interchangeable projectors
instead of two. It is designed primarily for extension of control; to permit better
checking of control, model to model; or to make use of sparser control, where
necessary.
