1489 Mapmaking device to draw contour lines from stereo-pair aerial
photographs. The cartographer mounts a pair of photographs on the flat
surfaces, aligns them, then looks in to see a stereo view. He can then move
the pen along what seems to be a constant height.
1492 A couple of hypodermic syringe plungers?
1493 Guess... If there were mounting holes, the pieces would form a hinge
(left piece down) so I'll guess they are used to form a temporary hinge with
the pieces clamped on to the parts of a work in progress in a machine shop.
1294 From the size and scale (the handle is between 1 and 2 inches long) I'd
guess this is a model of a heating furnace. Patent model?
I presume you're talking about #1494?
#1490 also looks as though it's designed to heat something and put out
hot air. I would have guessed shoes/boots that needed drying were to be
hung from the hook on the end, but there's only room to hang one thing
and, at nine inches tall, this device is too small for that.
#1494 is a model (or salesman's sample as previously suggested), and
definitely of a coal furnace. I've fed such a beast.
Below the fuel door is a covered water reservoir for generating some
humidity, I believe.
The ring going around the "floor" of the model is where the sheetmetal
jacket would fasten, joining to the sides of the cast iron
faceplate/controls panel. The diameter of the beast was over 6 feet, but not
more than 8 feet, to the best of my recollection.
The sheetmetal jacket was cylindrical, but had a tapered section at the top,
for about 25% of the overall height. The round heat distribution ducts, with
joints neatly wrapped with asbestos tape, were cut into the tapered "crown"
section to distribute heat to various remote locations in the structure.
On the fuel door, and below the fuel door, there were a couple of small
damper doors that could be operated remotely, by a chain control upstairs in
The little crank laying on the right side of the display model was for
rocking/rotating the large grate bars to let the clinkers fall thru to the
bottom, where they were shoveled out and put into buckets to be carried
The vertical handle was a sort of shaker, maybe intended to break up the bed
of hot coals, or to assist in cleaning out the ashes.
I don't clearly recall the cold air return path, but there were the commonly
seen tinned joist spaces and the wide cold air registers in the first story
The combustion gasses and smoke went out thru one of the big passageways in
that big donut-looking heat exchanger on top (to a damper before the chimney
connection, and the other protrusion was a cleanout door.
Everything except the sheetmetal jacket, crown and ducts was cast iron, and
all of the cast parts were heat exchanging surfaces.
The link below has a photo of the grate as seen through the open door at the
bottom of the furnace, the handle attaches to the part at the front left,
your description of this mechanism sounds good to me.
The handle can be seen in the bottom right of the third photo:
1489: Some grad student's way of finally seeing those darned "hidden
1490: Ye Olde Fyre Starter
1491: Difficult to use rubber stamp
1492: In Texas, laboratory glassware is illegal to possess without a
license because it can be used for making drugs. Perhaps
England has a similar rule, and these are new drug-proof
1493: TP holder
1494: Portable heater/humidifier.
"Rob H." wrote in
1490 looks like some elaborate mouse trap. Not sure why they
didn't just give the mouse an easy way up instead of the
perforated sheet metal though...
1489 - Machine for generating perspective drawings from isometric
drawings/photos, or some similar purpose. Looking in the two eyepieces
and moving the pencil around would, I assume, line up spots on documents
on the two platforms, and that would indicate the correct spot to mark
the feature on the "output" drawing.
1490 - Maybe a moustrap, the little critter climbing up the perforated
tube and then being unable to escape from the cup? But it seems a bit
small for that to work well.
1491 - Well, it clamps onto a thin surface or similar, and then,
ummm...ah...erm...well, I guess it's so obvious what you do that I
needn't bother explaining it.
1492 - Containers for reagents nos. 1 and 11.
1493 - Paperweight and runaway pencil catcher for the drawing board.
1494 - Cheating and googling revealed that this is a sales model of a
Williamson Model A furnace, which I presume was a coal-fired domestic
hot air furnace. In the basement of my house is a Williamson Oilsaver
furnace of slightly more recent vintage (but still forty or so years
old) that, at the last cleaning/testing, was found to be 81.7% efficient.
Now to see other guesses.
Posting from rec.crafts.metalworking as always.
1489) An optical tool for comparing two images or objects, or
for viewing in 3D.
I would think that it would be used with two ariel photographs,
taken some precise distance apart to provide the separation to
make 3D distance judging possible
I don't see enough detail, but I suspect that the two pans can
be moved relative to each other, as well as rotated to align
some reference point in the two images. At that point, you can
visually judge height differences of anything showing up in both
photos -- and if you know the distance between the two photos,
can probably also measure the relative height of the features.
The pen holder allows you to mark things found onto another
piece of paper.
Hmm ... perhaps the depth perception would allow you to use it
to trace height contours onto the third piece of paper.
Probably fairly old, as I believe that all of this is done by
computer these days.
1490) A device to trap and drown mice. The lower container holds
The bait is held just at the edge of the platform, or perhaps
mounted on the platform, with a counterweight on the exterior
The mouse climbs up the perforated tunnel, out onto the platform,
and at a certain point the platform tilts dumping the mouse into
the water. There is nothing for the mouse to grip, so it swims
until exhausted and then drowns.
Was this commercial, or a home-built one?
1491) Not really sure. Perhaps to plane a groove in a wooden
1492) Plungers (pistons) from different sizes of hypodermic
syringes. The OD of the cylinders is ground to a precise fit
inside the matching syringe body, which contains the markings
for the amount of fluid injected or otherwise transferred. (I
use them for putting cutting fluids at the bottom of the groove
made when parting off metal in a lathe. It is difficult to
squirt it so that it runs down into the groove where it is
needed, but a dulled needle will put it right where you need it.
1493) Looks like a hinge intended to be welded to two parts of a
project so the door can be lowered into place. (Of course, you
need two of them at least for most things.
1494) Perhaps part of a coal fired hot air furnace? The pulley at the
bottom probably keeps the coals and ashes stirred as well as
perhaps powering something else.
Now to see what others have said.
[ ... ]
Which is very good when you are measuring out aggressive organic
solvents, which would tend to attack both the rubber seal, and (perhaps
also) the plastic body.
Of course, they were reusable in that period, and glass is
easier to sterilize than rubber.
I tihnk you have it about right, but its probably for something bigger
than a mouse or rat. But I think the bait is hung off of the wire, and
probably there is some sort of cover that seals the bait in. The prey
goes in the entrance at the bottom and climbs the tunnel, smelling the
bait but unable to get at it, and at the top it squeezes out on top of
the bucket, and the top tilts and it falls it. It might be a live trap
rather than a drowning trap. The prey has to be quite large; a mouse
or rat could easily get through the holes in the perforated
tunnel....maybe its for squirrels or muskrats?
That makes sense, the ones that I have come out of a lab that was
shut down, they did environmental work and handled a lot of acids and
I think they were directly coupled to reaction chambers and used to
introduce measured amounts of chemicals as needed.
Some of the glass work that came from this lab is very complex, I'm not
a chemist, so I can only guess at what some of it was used for.
Anybody need a zero air generator?