The San Francisco call., 1909-10-17
NOVEL LAMP TESTS
MADE IN ENGLAND
Data to Assist Prospective
Buyer Secured by Royal
Automobile Club

With the view OF obtaining data
which would aid the automobilist in
selecting the lamp to suit his. needs
a series Of Sests were held recently by
the Royal automobile club at the
crystal palace London.
Some 46 lamps We're entered in the
comparison tests, representing. almost
all the English and continental makes.
After the tests the judges issued GER
tlficates TO each maker showing the
exact performance of each lamp, the
full results being published in the
Royal Automobile Journal. The tests
are considered of great value to the
makers as we'll as to the public, both
in aiding in the selection of high class
lamps as well as safeguard against
inferior productions. Aside from the
tests as to penetrating qualities and
intensity of the projected beam, tests
were made as to the amount OF side
diffusion, etc
Previously to making the photometer
or optical efficiency tests with the as
sembled lamp itself demonstrations
were made of the naked" candle
power of the electric bulbs and burners
used. knowledge Of the available
candlepower furnishes a key to the
checking and determining OF the op-
tical efficiency of the lamp.
In the tests portable photometer
was provided with a screen on which
were the grease spots" and self
contained light of known candle
power Illuminating the inner surface
of the screen. AT one end OF the 100
Z off in
yards, the lamps tested were arranged
at given distance from the ground
and the intensity of the projected light
was measured by advancing or retreat
ing the portable photometer over the
measuring tape until the lights on
each side of its screen balanced each
other as shown by the disappearance of
the grease spots To one side and
feet to the rear of the lamp under
( test was located an Illuminating board
! with cross painted on it, the glare
of the lamp being determined by
measurements of the distance away
that the cross design could be dis
tinguished.
The portable photometer was ar
ranged so that its height from the
ground could be fixed at either or
The tests of the lamps were completed
point midway between the lamp and the
mark at which the spots" disappeared
with the meter in line with the
lamp and then shifting it to each side
until the spots" again disappeared,
thus measuring the width Of the pro-
jected beam at that distance.
Besides the distance OF the projec-
ton along the axis of the lamp four
further points were determined, two
| at q height of 4 " feet and two at a
| height Of feet above the ground
where the standard lamp of the pho
tometer and the light cast upon the
spots by the lamp tested neutralized
each other.
The certificates issued for each lamp
are on the basis of marks, 80 per cent
! referring to the reduction of glare, Sd
/ effectiveness of illumination, "a to
range of light cast forward Is to
| horizontal dispersion, II per cent for
| freedom from back reelection and the
remaining Il per cent to the. design
and construction of the lamp itself
| The Speedwell motor car company viii
add another saw tooth factory building
to its already large plant. This build
/ ing of steel and brick, wita cement
! floor. will be occupied by the upholster-
ing and painting departments, which
! have been sorely cramped for room
Another building equal in size to this
/ is Contracted for and will be erected
at once.
| A new ordinance relating to garages
| is being prepared in Buffalo. It pro.
videS for fhe erection of a garage ir