rammetry 
Corps at 
President 
lotogram- 
ie Society 
(3.53. 
y greater 
lvantages 
rill be in 
ic lenses 
ight alti- 
struction, 
veys has 
g instru- 
nce than 
. A plot- 
asic pro- 
x, having 
/m, and 
duced by 
ently de- 
ngineers. 
n of the 
ry Kelsh 
ulness in 
ummetric 
ll in its 
3ausch & 
a photo- 
“staff of 
riving to 
“and to 
t the de- 
new re- 
is being 
through- 
and new 
resented. 
possibly 
sign and 
initiative 
ying the 
mapping 
it is the 
) Optical 
ff photo- 
o do its 
e past in 
  
promoting the science of photogrammetry, 
and to produce instruments of the degree 
of quality necessary to the demand for 
precision in this science. 
BIBLIOGRAPHY 
Ott, H. G., “The Contribution to Mapping 
Errors of Various Imperfections in the Con- 
struction and Manipulation of Multiplex 
Equipment,” PHOTOGRAMMETRIC ENGINEER- 
ING, Vol. VIII, p. 110, April-June 1942. 
Pestrecov, K., ‘Calibration of Lenses and 
Cameras," PHOTOGRAMMETRIC ENGINEER- 
ING, Vol. XVII, pp. 398-400, June 1951. 
Pestrecov, K., “Unit Planes in an Optical 
System Including a Plane-Parallel Plate,” 
Journal of the Optical Society of America, 31, 
pp. 338-341, April 1941. 
Pestrecov, K., ‘Photographic Resolution of 
Lenses,” PHOTOGRAMMETRIC ENGINEERING, 
Vol. XIII, pp. 64-85, March 1947. 
Pestrecov, K., and Ingalls, A. L., “Centering 
of Optical Systems,” Journal of the Optical 
Society of America, 38, pp. 343-349, April 
1948. 
Rayton, W. B., “Future Possibilities in Aerial 
Photography,” PHOTOGRAMMETRIC ENGI- 
NEERING, Vol. IV, p. 209, October, Novem- 
ber, December 1938. 
Sharp, J. V., "Bausch & Lomb Auto Focus 
Rectifier,” PHOTOGRAMMETRIC ENGINEER- 
ING, Vol. XV, No. 3, pp. 436-439, September 
1949, 
Sharp, J. V., "Increased Accuracy of the Multi- 
plex System,” PHOTOGRAMMETRIC ENGINEER- 
ING, Vol. XV, No. 3, pp. 430-436, September 
1949. 
Sharp, J. V., “New Developments in B & L 
Multiplex Instruments,” PHOTOGRAMMETRIC 
ENGINEERING, Vol. XV, No. 3, pp. 426-430, 
September 1949. 
Sharp, J. V., “Quantitative Basis for Compari- 
PHOTOGRAMMETRIC ENGINEERING 
   
35 
son of Systems of Mapping," PHOTOGRAM- 
METRIC ENGINEERING, Vol. XIV, No. 4, p. 
547, December 1948. 
Sharp, J. V., “Basic Factors in Photogrammetric 
Instrument Performance," PHOTOGRAMMETRIC 
ENGINEERING, Vol. XVI, No. 1, pp. 118-127, 
March 1950. 
Sharp, J. V., “United States and International 
Methods of Comparing Accuracy of Photo- 
grammetric Instruments,” PHOTOGRAM- 
METRIC ENGINEERING, Vol. XVII, No. 3, pp. 
358-361, June 1951. 
Sharp, J. V., and Boughton, O. W., “Develop- 
ment of Bausch & Lomb Autofocus Recti- 
fier," PHOTOGRAMMETRIC ENGINEERING, Vol. 
XIV, No. 3, pp. 349-357, September 1948. 
Sharp, J. V., and Hayes, H. H., "Effect on Map 
Production of Distortions in Photogrammet- 
ric Systems," PHOTOGRAMMETRIC ENGINEER- 
ING, Vol. XV, No. 1, p. 159, March 1949. 
Sharp, J. V., and Sparling, R. J., *A Functional 
Comparison of Stereoscopic Plotting Instru- 
ments," PHOTOGRAMMETRIC ENGINEERING, 
Vol. XIV, No. 3, pp. 358-362, September 
1948. 
PATENTS 
No. 2,164,847. Projector, O. E. Trautmann, 
July 4, 1939. 
No. 2,200,594. Method and Apparatus for 
Aerial Mapping, O. E. Trautmann et al, May 
14, 1940. 
No. 2,263,341. Optical Instrument, H. F. 
Kurtz, Nov. 18, 1941. 
No. 2,363,388. Optical Instrument, O. W. 
Boughton et al., Nov. 21, 1944. 
No. 2,456,333. Photogrammetric Projection Ap- 
paratus and Diapositive Adjustment Means, 
J. V. Sharp et al., Dec. 14, 1948. 
No. 2,557,698. Method of Correcting Residual 
Radial Distortion in Optical Image-Forming 
Systems, J. V. Sharp, June 19, 1951. 
Brock AND WEYMOUTH—AERO SERVICE CORPORATION 
The Brock Process of topographic 
mapping was developed by Arthur and 
Norman Brock of Philadelphia, with the 
aid of their mechanical designers, Edward 
H. Cahill and Niels Pederson, and their 
optical designer, L. J. R. Holst. 
The first Brock camera was designed in 
1914 and completed in 1915. Built to use 
cut films and tin-types, it was the first 
American aerial mapping camera. À year 
later Norman Brock built the first of his 
glass plate cameras, an automatic camera 
and equipped with a magazine of thirty- 
six 4 inch by 5 inch glass plates. This 
Brock camera was tested at Fort Sill, 
Oklahoma, in the summer of 1915. It made 
the first vertical air photos for mapping 
purposes taken in the United States. These 
were compiled into the first aerial mosaic 
ever compiled anywhere—crude and un- 
controlled, tó be sure, but the true fore- 
runner of the dependable modern mosaic. 
The early Brock cameras were purchased 
by the French Government after extensive 
tests at Langley Field, and it is believed 
that they saw service in World War I. 
Another Brock camera was used at the 
Mexican border in 1916 by the Brock