Bar-Lock Advertising Inkwell/Penholder
with square vault light cover for inkwell. Embossed:
"BAR-LOCK · PAT'D OCT.13-1903 · MAY 24-1904 · 2/3 ACTUAL SIZE"
- Patents by William L. Caldwell
- Incorporated 8/17/1921: "American Bar-Lock Co., Queens, skylights,
$75,000; L. B. and D. E. Mulford, C. H. Law; attorneys, Caldwell &
Polhemus, 50 Church St."
—New York Times
Apr. 16, 1908.,
In re– Theater Bldg.
Messrs. Hardy & Ryan,
Does any portion of the building in
which you are interested require daylight? If so, why not get the
best and strongest?
SIDEWALK and FLOOR LIGHTS: Our patented
"Bar-Lock" Sidewalk and Floor Lights need no introduction. The
leading railroads, corporations, architects, engineers and builders
throughout the country have endorsed them. They have superseded all
other constructions. They are furnished in Porcelite, galvanized or
painted with patented "3"-Point Prisms or "Arch Plain" Lights and can
be installed by an ordinary cement man. They are made to any size
and shipped in a few days after receipt of order.
The Patented SKYLIGHT "3"-Point Prisms
or "Arch Plain" Light System with "Bar-Lock" Porcelite Wrought
Steel Construction containing cross steel channel bars
locked into the heavy supporting steel bars, is adapted to all forms
of overhead lighting and possesses advantages which give it
preference over all others.
Read the enclosed circular and if
interested, send for special catalogue, prices, etc.
|Dic. L. W. M.
||Yours very truly,
AMERICAN BAR-LOCK CO.,
L. W. Mulford,
|A FULL DESCRIPTION OF PATENTED
"BAR LOCK" VAULT LIGHTS, FLOOR
LIGHTS AND SKYLIGHTS WILL BE
FOUND IN "SWEETS INDEX."
ILLUMINATION AND DURABILITY
ARE ONLY OBTAINED BY USING THE NEW
WROUGHT STEEL CONSTRUCTION AND
Absolutely better and cheaper than any other construction
now known for Pavements, Basement Illumination,
Court Areas, Balconies, Porches, etc.
American Bar-Lock Co,
Philadelphia, ca.1908, 12p
JPG ~18MB: tar|zip|pdf
PNG ~95MB: tar|zip|pdf
Water-proof — Fire-proof — Burglar-Proof
Sound-proof—No Repairs—Unrestricted Light
NOTE THE HEAVY I-BEAM REINFORCEMENT
American Bar Lock Co
Philadelphia, ca.1915, 12p
JPG ~12MB: tar|zip|pdf
PNG ~93MB: tar|zip|pdf
The National Builder, June 1905
LIGHT PROBLEM SOLVED.
Remarkable Results Obtained in Vault llumination.
In proportion as the incandescent
electric light outshines in brilliancy the ordinary gas jet,
so Bar-Lock Galvanized Wrought Steel Construction and "3 Point"
Prisms surpass in effective results every other form of vault,
pavement and floor illumination.
This bar-lock device is already
recognized by leading architects and engineers throughout the country
as the most satisfactory system of vault lighting yet devised. The
points of superiority over the old form of cast iron frames are
manifold. Its construction of wrought steel bars set on edge, with
heavy channel bars intersecting at right angles, clamped in place,
gives it rigidity and strength without being cumbrous. This plan of
assembling provides for a 77 per cent of glass area, as against 25
to 35 per cent possible with weight sustaining safety in the old
style cast iron frames.
The steel, being galvanized, is virtually rustproof, while
the grooved channel bars afford a deep interlocking rib of cement
between the glasses, producing a thoroughly watertight binding. The
"3 Point" lens is comprised of three distinct prisms of different
angles in such a way that they diffuse light in three directions,
producing the maximum degree of refraction. For vault locking
Bar-Lock and "3 Point" Prisms have proved their effectiveness,
as basements and cellars where they have been installed require no
artificial illumination during daylight. A strength test showed the
Bar-Lock capable of sustaining a weight of 384½ pounds to
the square foot, without any appreciable deflection.
The American Bar-Lock Company has
recently completed its new factory at Twenty-sixth street and
Pennsylvania avenue, Philadelphia, Pa., and has moved its offices
to this location.
The National Builder, August 1905
RIGIDITY, STRENGTH, ELASTICITY.
Extraordinary Results Obtained From
Bar-Lock and "3-Point" Prisms Installation.
An important and valuable improvement
in the detail of building is the Bar-Lock Galvanized Wrought-Steel
Construction and "3-Point" Prisms, which device is now being
generally employed in large modern structures either for pavement-vault
illumination or for the lighting of floors in warehouses and
stores. Bar-Lock has several points which recommend it over the old
form of cumbrous cast-iron frames. Its construction of steel bars
set on edge, with channel bars intersecting and clamped at right
angles, gives rigidity and strength. This latter essential quality
is illustrated by the fact that in a recent test a section of
Bar-Lock and "3-Point" Prisms withstood a distributed weight of
384½ points to the square foot, showing only 3-32 of an
inch deflection, which was recovered immediately upon the load
being removed, indicating rigidity, strength and elasticity under
Another quality, the value of which
is recognized, is the great glass area Bar-Lock makes possible
without sacrificing strength. The glass area in the old-style
cast-iron frame is from 25 to 35 percent of the whole exposed
surface. Bar-Lock with "3-Point" Prisms gives 77 per cent, an
increased of 100 per cent. The "3-Point" lenses refract the
maximum degree of light, each of the triple prisms deflecting
rays independent of the other. The effect of this action is
at once satisfactory and attractive. One user of their system
declares: "The wonderful results obtained from your beautiful
installation exceeds even my most sanguine expectations. The
effects are dazzling, and I consider it the best system I have
ever seen." By the use of cement between the glasses—"3-Point"
Prisms or "Arch" plain lenses—makes a thoroughly water-tight
binding around and under each glass, so that there is no
possibility of leaks.
The American Bar-Lock Company has
recently occupied its new and enlarged factory and offices
at Twenty-sixth street and Pennsylvania avenue, Philadelphia,
Pa., the enormous demand for the system making it necessary to
increase the facilities for production. An illustrated catalogue
has been recently issued giving details of the construction of
Bar-Lock with "3-Point" Prisms and showing the various uses to
which it is applied.