SIXTEENTH ANNUAL REPORT 95 
from the outside, and as they pass through the ribs, of increasing 
their actinic quality. With reflecting surfaces of white, instan- 
taneous exposures will be possible. A rapid exposure in a gal- 
lery of this type yields a finer result than the same exposure out 
of doors. The reason is obvious. In strong, direct light there 
are large patches of light and shade only; while with strongly 
diffused light of highly active quality, each detail is distinctly 
modeled, giving a rounder and more perfect image, and a 
better rendering of color value. 
Appended is a list of photographs made during 1911: 
Briatsstor- Du bMCatlOM ecco cea eo rie eh a ee ee 1,069 
LECTET OW ASHSTO 6 Le Se Dee E Ree con Caen eet aa ns Reheat ep emee 209 
Brinisshor-aloumsZzandy les: sae neces Geccs 1,100 
3,378 
DEPARTMENT OF ENGINEERING 
George M. Beerbower, Civil Engineer. 
The most important work of our engineer has been in de- 
signing and superintending the construction of the new Bear 
Dens, the Eagle Aviary, the Shelter House for tropical birds of 
prey, the Pelican House, a new concrete bridge to be erected 
north of Bronx Lake, and concrete steps for the new Bear Dens. 
In addition to this he contributed materially to the plans for the 
new Service Building; he has laid out and established grades for 
new walks around all the new installations and the new service 
yard, prepared the budget exhibit, and revised and brought down 
to date the record maps of the Park. 
Along with duties and services such as those enumerated, 
there is each vear the usual accumulation of miscellaneous tasks 
that are not chargeable to any important work, but at the same 
time are imperatively necessary. Mr. Beerbower’s presence in 
the Park is of such daily importance to our general progress 
that it is not always an easy matter to proceed without him 
while he is on his annual vacation. For this reason, his vacation 
usually is taken in several different periods, rather than in one 
continuous absence for his full allotment of time. 
DEVELOPMENT OF THE PARK EAST OF THE BRONX RIVER 
The improvement of 180th Street along the extreme southern 
boundary of the Park, in West Farms, coupled with the construc- 
tion of the New York, Westchester & Boston R.R., skirting a por- 
tion of our eastern boundary, has completely changed the aspect 
of the southeastern corner of our grounds. 
